I went to view ne last year in a similar condition, with nettles surrounding it higher than the windows, took a petrol strimmer to the undergrowth to see the car, opened the door...OMG, it nearly knocked me out the smell in there, apparently the owner used it to 'cage' their dogs when the postman used to come to the house!!!
I passed on it as there was only a couple of good parts on it...6months later a chap contacted me asking if I wanted to buy an a2 he had 'saved' from a field....you guessed it, the same car...as he towed it out of the field, both lower wishbones collapsed, exhaust was left behind, together with the front bumper, it looked like Herbie on an hangover!!!!!
Needless to say, I passed on it again, he had taken the 'bits' that he wanted off it and offered me the scrap leftovers!!!
Nice to see that there are some worth saving from fields, but its the hidden thigs that would catch you out, perished rubbers, belts, brakes etc.