GBP deposits are possible via Barclays, and withdrawals will be implemented soon.
Are GBP deposits via Barclays sent from the bank before the "multicurrency thing" was introduced, and the 2.5% announced, are they exempt from the 2.5% currency conversion fee?
Still, users who only read
https://mtgox.com/users/addFunds and read "If you have a bank account in UK, you can send GBP direct deposit IN GBP to our UK bank account, free of charges", and deposit GBP hoping that it will be converted to USD free of charge, may now be surprised by the 2.5% fee, and it would be fair to put a notice there (at the GBP deposit form with Barclays bank details) that if you don't set an option to create a GBP wallet, your GBP will be converted to default USD wallet at a 2.5% fee, not free of charge like it was before.
You should not change rules/fees like that (free GBP/USD and now suddenly 2.5%) without informing users using this method at a place they are likely to notice (the deposit form with UK bank account data). Not everybody reads the support pages, and now the only place one can find out its gonna cost 2.5% is
https://support.mtgox.com/entries/20413328-mt-gox-opens-15-new-currency-markets and not everyone even knows or have been at support.mtgox.com pages, I suspect most users never been there. Hey, even this page:
https://mtgox.com/users/settings?page=settings doesn't say anything that it's gonna cost 2.5%. Before GBP->USD conversion was free at forex rates, so one would assume that the new conversions also.