Here's a selection of my current not-baking-hot-day footwear:
comfy ballet type
hush puppies - really comfy but keep them away from gravel thanks to the covered heel
I also rate Caprice mary-janes - the ones I bought last year seem to be discontinued but they are supremely comfortable, lovely padding in the sole, my feet just smile when I put them on, and I think their others would be similar.
Also fabric, "sporty" Mary Janes from people like Lands End or Cotton Traders (I got mine from a Sunday supplement sale ad) - not great for a downpour, but the rubber outsole will keep you reasonably dry in most British wet pavement scenarios.
this type of thing