Thanks for the suggestion Raleighfarm, luckily where we are render is used sparingly, so if we went for a full render we would be the odd ones out! Still waiting to get PD's verdict on what to do, I wish they would hurry up.
Hopefully that means you will get a response from PD very soon. A similar thing happened to us, we were told that our rep was having a meeting with his boss on the Monday and that he would get back to us on the Monday, however, on the Thursday following, my girlfriend went past the house and saw our rep there with a couple of other guys, an hour later I got the call to say that all the bricks were poorly done and the next step was to work out how to resolve it, so with a bit of luck, you will have a response within days, I have my fingers crossed for you