User talk:2A00:23C7:A82:B01:CD67:1844:ED03:2349

Douglas Pobjoy did not start in the engine business at Cosmos Engineering: He gained his BSc in Motor Car Engineering in 1913 from Bristol University, and worked with Fedden from 1914 at Brazil Straker & Company.

The 'P' Type engine was not developed with George Parnall. It was designed in 1925 before the Swift was ever thought of.

The 1934 Niagara was not 130 hp as you claim.

You are wrong regarding the capacity (cc) of the Niagara IV.