From what you are saying it sounds like I can finally relax on the DPF issue!
Thanks for your input on it mate, it's been a huge help.
I was told by the prev owner (very genuine old fella) that the codes read said the ECU had failed and the Volvo dealer told him as it had failed the car wouldn't allow the service light to be reset and once this was fixed/replaced it would?
He also said he had been quoted £400 for replacement if that helps?
Thanks again Clan, you've been brilliant bud