I can drive in almost anything, including towering heels. For long distances though, I like my converse or a pair of pumps. Re: flip flops, no they are not illegal....... BUT. Six years ago on a very hot Summer's evening I was coming from Tamworth snowdome having been skiing (yes really) and had changed into flip flops. I approached a junction near home just as lights were changing and was braking to stop. However, my flip flop sort of slipped off my foot and off the brake, resulting in literally crawling at a ridiculously slow speed across the junction and being flashed and consequently fined £60 and having driving licence endorsed with 3 points for jumping a red light ! You have been warned.