Yes, agreed with Lorraine. Testing a boiler effectively makes it a pre-used appliance as far as the GSIUR is concerned.
The firms that I thought might be able to help wouldn't go as far as Hemel Hempstead I'm afraid, if I hear of any others I'll post back.
The firms that I thought might be able to help wouldn't go as far as Hemel Hempstead I'm afraid, if I hear of any others I'll post back.