I seem to have done 4 "first" solos. At least they all had that magic feeling that the genuine first one gave me. That was as an ATC cadet in the wonderful Mk III at St Athan. About 8 years later I took up gliding at Dunstable and was sent solo in a Prefect. The first power solo came in 1967 in a beautiful Tiger Moth at Old Sarum, in the good old days when it was an RAF station and you could always land into wind.
I stopped flying for 23 years and started again in 1997 at Bournemouth. Because I never thought I would ever fly as PIC again, the first solo in a C152 was absolute magic as has every one of the hundreds of flights I have done since.