It looks to me like there is plenty of top coat mate, there is a decent depth on the pic when they are polishing it, it may well be that it wasn't baked or cured enough when they polished it and let you have it, we have the same problem, even though we bake, the paint is still not cured when we let the car go, I recon you have a good chance of getting a decent finish, I'm also free on Saturday afternoon and will gladly have a crack at it for you, not that I want to stand on anyones toes of course, the only cost to you will be the fuel to get it to Grimsby, and to make the tea of course.