Hi Everyone
Sorry for not getting back to you sooner but I was away on holiday.
Just a quick update on the window issue- I started reading about some limit switch which operated if there was an obstruction and due to the state of the old regulator, I wondered if the window guides could be sticking. I had already sprayed them inside when I fitted the new regulator but just to be sure, I sprayed the guides from the top with quite a lot of WD40 and they now work a treat.
Thanks again for all your comments.