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What training aircraft came from the Beagle Pup?
Short answer
The Bulldog: the Pup evolved into the Beagle B.125 Bulldog, a trainer fitted with a 200 hp (150 kW) Lycoming engine. Beagle had always wanted a military version of the Pup to replace the Chipmunk in particular. After Beagle closed, the design and production passed to Scottish Aviation.

The Pup and its military version
The Beagle B.121 Pup was a British two-to-four-seat single-engine training and touring aircraft of the 1960s, built by Beagle Aircraft Limited. The prototype, a Series 1 registered G-AVDF, flew from Shoreham Airport on 8 April 1967. Beagle had always intended to build a military version of the Pup, aimed in particular at replacing the Chipmunk. The design was significantly improved, resulting in the Beagle B.125 Bulldog, fitted with a 200 hp (150 kW) Lycoming engine.
The B.125 Bulldog
The Bulldog is a British two-seat side-by-side trainer, with an optional third seat, designed by Beagle Aircraft as the B.125 Bulldog. The prototype flew on 19 May 1969 from Shoreham Airport. The Swedish order arrived on 12 June 1969.
From Shoreham to Prestwick
In December 1969 the government withdrew financial support from Beagle, and the company was placed under receivership. Before any production aircraft had been built, Beagle Aircraft ceased operations. Beagle completed only one prototype, with another nearly finished, and in 1970 the design and production passed to Scottish Aviation along with the Swedish order. All subsequent aircraft were built at Prestwick Airport by Scottish Aviation and, later, by British Aerospace.
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