Like most chaps on this thread ...
1st solo was in a Kirby Cadet TX Mk3 (although T31B sounded a bit more aggressive back then) XN246 with 617 VGS RAF Manston September 1973 ... I remember it was a bl00dy cold day ... and yes the unit badge depicted a Mk3 with a "Bouncing Bomb" slung underneath doing a final run at a Dam !
Mind you ... I now feel very old as XN246 appears to be a museum exhibit at the Southampton Solent Sky Aviation Museum
1st solo powered aircraft was in a C-150 Aerobat G-AYUY with The Cinque Ports Flying Club at Lydd doing a Flying Scholarship.
Thinking back now ... the confidence gained doing the gliding solo at 16 made the powered solo feel very much a "matter of fact" moment.