These lovely but very cheap (£7.99) H&M flip flops lasted five minutes on the Brompton pedals. I had to come back and put on my sturdy but quirky Spanish clogs.
They looked fragile but I hoped they would be stronger. They are still in one piece but they would not have lasted the full trip and I would have been bare foot in the West End on a Sunday afternoon. But then I would have just gone and brought some more shoes!