I sent an enmail of enquiry and got a reply from a woman saying the car was her brother's and he died in a bike crash one month ago. The woman said she just wants to get rid of the car.It only has temporary plates/registration. The advert is is a german website, but the woman and car are in England. What do you think. I'm worried it's a stolen car.

yes it's stolen.
wise up..nothing is FREE.