Lights

sure you are removing the right side? one is fat and fixed-ish one is slim and easy to get off, I have mistakenly flipped the fat one which allows the thinifer to bugger off across the road...

Yeah, I realised that, but it's cold, dark, everyone's rushing to get in the pub after lock-up. The difference in size is hardly discernible you don't want to be standing around trying to figure out which side to take out.