UK Regulations on Sending money to Brazil

Transferring money from UK to Brazil is expensive, however I usually find that having a UK bank account helps when withdrawing money directly from a Brazilian bank. Just take cash from the cashpoint machine. The exchange is much less for smaller transactions than going through the transfer process.
Depends on the amount or frequency of your transfers.

Try TransferWise

Thanks I will, transfer wise seems to be the best option outside of bank transfers. It still costs considerably more than most other transfers though, Foes anyone have an idea why? What are the regulations that make this exchange so costly? And is this a UK / Brazil issue, or is it just transferring from anywhere to Brazil in general ?

Anywhere to Brazil is expensive. Not sure why, but I presume taxes is one, also the banking system is different, I.e no IBAN exists, so depending on currency, your money may get routed via elsewhere so this increases fees also.