Hi Pete
My husband and I(unfortunately) bought a Persimmon home just over 2 years ago. Having read your posting I have to agree with everything you have said. They are all sweetness and light until they get their grubby hands on your money and then their 'customer services' go straight out of the window. We have just discovered that the front canopy over the house is falling off!! Persimmon say that our 2 year guarantee has expired and 'its no longer their problem'. They also say that this is probably due to fair wear and tear!
Surely you don't expect the front of your house to fall down after 2 years. Or maybe with a Persimmon house you do!
Walking around the house (both inside and out) I could cry. There isn't a single room that hasn't got faults, whether it be mis-aligned doors, bad plasterwork or wahtever. I would NEVER reccomend Persimmon to anyone, and the funny thing is that when I tell them this they don't even give a damm!