I might be able to get away with the solar charger but there's a very good chance it would get nicked so not worth the risk really.

Yeah I've had to jump start in a petrol station before, luckily I had a jump starter pack so just did it quickly and drove off. Wouldn't want to go to a petrol station knowing I'd have to do it though.

I also felt a complete tit in my old mr2 which went flat at the pumps. Had someone help push me off to the side and get jump leads, opened up the bonnet, took the spare out and found out the negative terminal had come off the battery because the previous owner had put the wrong sized battery clamp on, the guy who was going to help me just laughed and walked off.