Robbie,
Sorry to be pesimistic, but listen to the experienced guys on here, I know its easy to get carried away when keen to start a new venture, but dont live to regret it.
Personally from what you have said so far, if you can get your hands on £25000,
I think you could do a whole lot better. What you need to find out is, what his database's average job ticket is. i.e. how muich per room or square foot/yard, 3 piece suite has he been charging. If his regular customers have only been used to paying a low price, and you go ahead, you will not be getting time off to enjoy with your family, you will running round like a headless chicken from job to job and making very little money in the process. If however his pricing has been on the high side, then thats another matter, but you will have to do some clever transfer marketing to avoid losing more than half the database, which WILL be lost when the business changes hands.
Dave.