There are few things I love more than colorful markets. On my flight to London from Milan, I met the nicest British guys (Alex and Max) who gave me a slew of suggestions despite the fact that I'd studied abroad in the UK the year before.
Thankfully, their Borough Market tip was spot on. Along with great produce that I've come to expect at all food markets (it's the California in me), they had other unique things like mushroom pate and micro growing gardens. Even though the market was a side of London I hadn't seen before, I felt right at home.