I've been on the lookout for some flat shoes...and came across these Topshop Victoria2 Face Pumps (£25):

So cute! Hopefully they'll have them in stock the next time I stop in Topshop.

Update: I tried these on and unfortunately they hurt my heel :( However after trying on about 10 pairs of ballet flats, I did manage to find a pair of super comfortable grey ribbon flats. Woohoo, mission accomplished!