A few days ago I passed a Symphony lorry parked at the far end of the park; this immediately reminded me of (not work-safe) A Bad Day at the Office with Tom Baker.
More generally, over the past couple of weeks there seems to have been an ice cream van stalking around the park. As a child the only tune I ever remember hearing from an ice cream van was Hugo Alfvén's Midsommarvaka Swedish Rhapsody, but in recent years I have noted Glenn Miller, Match of the Day and Whistle While You Work. This particular van, however, is a bit more upmarket, playing as it does the Eton Boating Song. For some reason I recall the Boddingtons ad from a few years ago, and given that we are not a million miles from Henley, I have visions of Boris Johnson rather unsuccessfully enunciating, "D'you want a flake in that, chuck?"