Hi Micky,
I think I misunderstood your question. Any entries that you created while *in* Brazil, will have the time in that TZ. e.g. if you create an entry starting at 9am in Brazil, it will stay 9am and not 'convert' to whatever time it was in the UK. If you need them in the UK TZ, you would have to recreate them and then delete the originals. I had originally thought that you meant that when you got back to the UK that it was still creating "new" entries in the UK, but using the Brazilian TZ.