Aerofan in LECU (cuatrovientos), i believe there are British instructors employed there now.
Better talk to them and do a search cause i know there are British pilots having done their FIC there, try to talk to them, so you'll have 1st hand info and more updated tham mine (2003).
In my opinion the course is good the price can't be beaten, the acft availability very good and you wont find better value for the amount of money.
They have a website with the lis of prices.
i did the 1st 10 hours on C150 Aerobat , the rest in a bonanza, including the test.
Another reason why i liked the school is that they do not ask you to pay all at the begining, and that believe me is uncommon
Good luck