As far as I'm aware BBC Radio 2 has the lists of the songs they've played on their website somewhere. There's probably a link straight to it, so if you hear anything in future you like, you can find it out quite easily. You could also ring the BBC and ask to be put through to the programme production office, who could look it up for you. ( I know - I used to work there and we had people phoning in quite often time for just such enquiries)