So I rang up the company yesterday and was told the guy who deals with this sort of thing is not in but they will try and get someone to ring me later. No joy, no call, so I thought I'd leave it until today. I got into work and got on with things and the phone rang, it was the guy who'd been off the day before. I told him the problem and he said he knew straight away what it was, bring it around tomorrow and he sort it out.....result!