Because these aircraft types were identical from behind the engine firewall (as commonality reduces costs), the Series 1 was heavier than it needed to be.

[7] Another issue affecting the Pup was unreliability, due to both poor design and workmanship, and the shortage of spare parts.

Flight magazine, commenting on the uneconomic construction, said that the Pup "appears to be designed not for production but as a one-off special in which cost was no object".

By 1969 production had increased at Shoreham to one Pup a day; aircraft were flown to either Rearsby Aerodrome or Cambridge Airport for painting and finishing.

Some remaining nearly-completed aircraft were finished at a variety of locations, the last being HB-NBA (s/n B121-177), first registered 8 March 1977, making a total of 175 Pups completed.

The project was put on hold until 2015 when restoration work began, and finally in the summer of 2020, the original Beagle Pup prototype took to the skies again.

[15] The Bulldog was also being assessed by the RAF, the RAAF and the Iraqi Air Force at the time when Beagle ceased operations.