A deal?

I've been offered a deal in Coventry. The sellers are desperate, as they want to buy a cottage form soemone who is equally keen to get to Spain as fast as possible. I think it might work. Rental would be £900 pcm. Value of property is, or could be interpreted as being, £167,000. There are some deals out there which would make it work. There would only be a couple of thousand immediate cash, but as the house is in excellent condition, this would not matter all that much. I'm trying to give them £145,000.
I do have some very good software which analyses deals. I've run this one through it. It stacks up. It doens't make huge profits to begin with, but it does work.
Fingers crossed that the surveyor will agree.