Here's a direct link to
LASORS
You can do the flying in Brazil and the theory in the UK, but you have to do it the other way round. You can do the training in Brazil, then come to the UK and do the exams. You then take your skills test in the UK and apply in the UK for a JAA license. You will need to do some flying in the UK.
Section C of Lasors states:-
Any previous flying experience in single
engine-piston (Land) aeroplanes gained during an
incomplete course of training towards an ICAO
PPL(A) may be counted towards the requirements
for the grant of a JAR-FCL PPL(A). Applicants will
be required to obtain copies of their training
records from their training provider, together with
confirmation from them that the training completed
was towards the grant of an ICAO PPL(A).
Applicants will be required to attend a registered
facility or approved FTO and provide evidence of
their previous training to the Chief Flying
Instructor. The CFI will then establish a course of
training taking into account previous experience to
ensure that all the specific requirements of C1.2
have been met.
There's a bit more to it, so work your way through the document.
If you get an ICAO PPL while in Brazil you can get a JAA PPL on the back of it. You will still need to do a sklills test. The rules say you can't do the skills test until you've passed the theory exams so that means you will have to do the lot.
If you have less than 100 Hr as pilot (so it includes logged p/ut time) you also need to meet the experience requirements (but if you have an ICAO PPL you'll almost certainly do so).
The main difficulty you are likely to have with this approach is that you'll need some extra hours to cope with the transition to UK, which might wipe out any saving you made by doing the initial training in Brazil.
Mike