The DH.4 was produced in prototype form by the Aircraft Manufacturing Co of Hendon in 1916, this aircraft (3696) making its first flight in mid August 1916 at Hendon, and was unusual in having dual controls.

As noted in the Diamond DA-40 article, the DA-40 series has continued to be developed by the manufacturers and has become very popular around the World in the training role.

The DH.53 was a low-wing monoplane and was probably the first really practical ultra-light aeroplane.