Just picked myself up from laughing at Mr Noggins post!
I am sure a few schools will ask for a 10hr conversion - but they are the ones you want to stay away from!!! Find a school which is prepared to give you an unbiased checkride and go to them. There are schools that will look down their nose at you because you learnt in the US and didnt give them your hard earned money. They are very easy to spot though and you will soon know when to about turn!
I have undertake 1hr checkouts and been signed off no problems by Bournemouth, White Waltham, Enstone and Sheffield - without 15-20 hours retaining!!!! So the training in the US cant be that bad.
You will always get bad schools but there again you will in the UK as well. Posters making sweeping statements like Noggins either dont know what they are on about or need to get their heads from up their backside