In the car on the way to London:
Schubert - Piano Trio D929
Chopin - Piano Concertos 1 & 2, Variations on 'La ci darem la mano'
In HMV while browsing:
Tchaikovsky - Symphony No.5 (Mvmts 2-4), Serenade for Strings
In the car on the way home from London:
Chopin - Fantasy on Polish Airs Op.13, Krakowiak Op.14, Andante Spianato etc. Op.22
Mozart - Clarinet Concerto, Bassoon Concerto, Oboe Concerto
Beethoven - Piano Sonatas Op.81a, Op.90, Op.101
Bach - Goldberg Variations
Brahms - Cello Sonata No.1 Op.38
Then, following some random tweeting by @iamamro & @mahlerfan2:
Pet Shop Boys - Discography
1. The Mozart Clarinet Concerto was the piece that I conducted the first time I ever conducted a full orchestra.
2. Yes, I did sing the rude words to Tchaik 5 while browsing the shelves of HMV! Ha!