Thailand–United Kingdom relations

Bilateral relations between Thailand and the United Kingdom date to the 17th century. Thailand has an embassy in London and the UK has an embassy in Bangkok.

In 1608, an English captain William Keeling met an ambassador of King Ekathotsarot of Siam in Banten. During the 17th century the English East India Company first arrived and established factories in the Ayutthaya Kingdom. In 1612, British merchants delivered a letter from King James I to King Ekathotsarot in regards to trade and establishing relations. The British merchants were welcomed warmly by the King. Later, in the 19th century, Britain became, along with France, one of the two major colonial powers exerting pressure on Siam, when it colonised Burma and Malaya to Siam's west and south. During this period, Britain gained significant concessions from Siam through various treaties, including the Burney Treaty in 1826 and the Bowring Treaty in 1855, which remained in effect until after the first World War. Britain directly and indirectly had a massive amount of influence on Siam's modernisation during the late 19th early to early 20th centuries, and the two countries remain important trade partners to the present day.

Ayutthaya and England
The kingdom of the Siamese has been known to the West since 1430; when the Italian Niccolò de' Conti first visited Tenasserim, then part of the Kingdom of Sukhothai. The first known Briton recorded to have set foot in the area that is now modern Thailand was Ralph Fitch who arrived in Chiang Mai (referred to as Lamahey in his account) in 1586. Fitch described the city as: "a very faire and great towne, with faire houses of stone, well peopled, the streets are very large", he then added that: "The women be much fairer then those of Pegu" He continued: "Hither to Lamahey come many marchants out of China, and bring great store of muske, golde, silver, and many other things", "They have such plenty that they will not milke the buffaloes, as they doe in all other places."

The first official contact between the Kingdom of England and the Kingdom of Ayutthaya happened in 1612 when an East Indian Company ship called the Globe sailed from Patani (where the Company had a trading station) to the Siamese capital at Ayutthaya. The mission was led by Lucas Antheunis who carried with him a letter from King James I, addressed to King Songtham. Antheunis was accompanied by Thomas Samuel, Thomas Drivers, Thomas Essington, Adam Denton and Peter Floris (who recorded the Globe's voyages). They arrived in Ayutthaya on the 15 August, becoming the first Englishmen to have ever set foot in a Thai capital. To great pomp, Antheunis and his colleagues were given an audience with the King on the 17 September. King Songtham was very pleased, and provided them with several precious objects and a three-storried brick house in Ayutthaya as quarters. In 1615 Antheuniss was replaced by Benjamin Farie, the King then entrusted him with a letter he wrote to King James I.

In 1617 the first English Factory was established, third behind the Portuguese and the Dutch, much to the latter's displeasure. By this time the King was on friendly terms with the English and granted them a further two houses, the English reciprocated by helping Songtham fight against the Cambodians in his wars. The English were mostly interested in trade and concentrated their efforts around the ports of Tennasserim, Mergui and Pattani. There were great rivalry and conflicts between the English and the Dutch to control these areas. Because of the constant conflicts, the low profits yielded and mismanagement, the factory was forced to close in 1623, despite the pleas of the Siamese King for the Company to continue its activities.

Return
In 1661 the factory was reopened, however very much like the previous period the Company's trade in Ayutthaya was unsatisfactory. A Mr. Potts who was in charge of the factory was described as a: "drunken and dishonest rascal and heavily in debt", Potts eventually set fire to one of the Company's godown in order to cover his embezzlement, when people came to help him put out the fire he promptly chased them away. In 1683 the Company sent two men; Strangh and Thomas Yale to inspect and evaluate the conditions of the factory. They arrived carrying a letter for the Emperor of Japan from King Charles II and nothing for King Narai, they then expected the Siamese to have this letter delivered to Japan for them. After insulting the host and the royal favourite; Constantine Phaulkon (a former cabin boy of a Company ship now first minister of Siam), they were shunned by the King and his court. The two men then closed the factory out of spite and returned to India. After realising their mistake Sir John Child, the President of the Company at Surat, decided to reopen the factory. New Company men arrived in 1685, during the same time as the embassy of the Chevalier de Chaumont from King Louis XIV of France. By this time French power and influence in Ayutthaya was at its zenith.

Conflict
In 1677 an Englishman named Samuel White entered King Narai's service. White was the younger brother of George White, a friend of Constantine Phaulkon, all having previously worked for the English Company. By 1684 White was appointed by the King to replace his compatriot Richard Barnaby as the Governor of Mergui (also called Shahbandar). In this position White became responsible for the handling of Siamese trade and defence in the Indian Ocean, as well as having authority over the city of Mergui and Tenasserim. Increasingly White began to conduct trade on his own accord, all of these actions were done under the protection of the Siamese flag, albeit without the full knowledge of the Siamese court. Soon White ran into conflict with merchants from the Kingdom of Golkonda (in modern-day Andhra Pradesh, India). In his capacity as Shahbandar, White declared war on Golkonda in 1685, and began seizing merchant ships in the Bay of Bengal for private gain. White and his subordinates (most of whom were English) began to commit indiscriminate acts of piracy, sometimes attacking ships under the Company's jurisdiction. As a result of his actions, Golkonda held the English Company to blame for these losses, due to the fact that the ships were led by Englishmen. When these complaints reached Ayutthaya, the King ordered a full investigation of White's activities, however because of his connection to Phaulkon all the charges were soon cleared.

In 1686 a ship named 'Tiaga Raja', belonging to several Indian merchants residing in Madras, was seized by White and brought back to Mergui. White briefly imprisoned the crew, before allegedly stealing £2,000 worth of belongings from the ship, he then set the ship free. When the crew returned to Madras they made complaints to Elihu Yale the President of Fort St. George. Subsequently, when White seized another ship belonging to an Armenian merchant residing in Madras, Yale declared war on Siam. The Company in London persuaded King James II to issue a royal proclamation, prohibiting any Englishmen to serve on foreign ships. To enforce this ordinance, two warships the Curtana and James was despatched to the Tenasserim coast. The aim of the company was to exact revenge and compensation for the Company's losses. Furthermore, the English also wanted to seize Mergui for itself and assert its military might over Siam before the arrival of the French.

19th–20th Centuries
Later, in the 19th century, Britain became, along with France, one of the two major colonial powers exerting pressure on Siam, when it colonised Burma and Malaya to Siam's west and south. During this period, Britain gained significant concessions from Siam through various treaties, including the Burney Treaty in 1826 and the Bowring Treaty in 1855, which remained in effect until after the first World War.

During the second World War in the 1940s, Japanese army men invaded Thailand and Malaya. Thailand resisted landings on its territory for about 5 to 8 hours; it then signed a ceasefire and a Treaty of Friendship with Japan, later declaring war on the UK and the USA. The Japanese then proceeded overland across the Thai–Malayan border to attack Malaya. At this time, the Japanese began bombing Singapore.

Britain directly and indirectly had a massive amount of influence on Siam's modernisation during the late 19th early to early 20th centuries, and the two countries remain important trade partners to the present day.

Economic relations
On 21 March 2024, the two countries signed a strategic partnership and launched a Free Trade Agreement Initiative to begin talks on a Thailand–United Kingdom Free Trade Agreement.