Thanks all. She slept in pram (don't have a car) but woke just now as we came in. Started crying again but got her on the breast before really kicked off. She'd had a bath, I took clothes in and off twice and eventually changed them in case of tags/prickles, tried skin to skin, singing, dancing, bouncing, white noise etc etc.
Thank god pram worked - will be out again if this doesn't work - but cursed to the bloody northern hemisphere winter. I had to come home as my finger were freezing! Walking around the streets gave me a chance to call my mum for some moral support though!
Thanks for all the tips everyone - and yes, I think she is overtired x a million. Here's hoping a decent feed will do the trick.