Thanks for the support guys. Rob, you're spot on, I took it to a repair place today and they reckon that although they can try and attempt to repair the rear panel, the folds in it (swage lines) will make it more difficult and it might need a new panel. Looks like the price of that is around £300 on its own. They reckon the smaller door dent will be easier to fix.
They're sending me an estimate tomorrow, and I'm going to take it to Toyota and get an estimate from them too.
I will try the estate agent, but I don't hold out much hope there, I have no idea where that pole would have come from, it can't have been that near my car, it obviously got taken there.