Most banks have special emergency phone numbers
Well I guess if he survived the weekend in that harsh and unforgiving polish urban wilderness, he will be just fine by now :-)
Related:
Making a one off payment to a Polish accountI have to make a payment of £3000+ to a polish account. Is there any special instructions for this or can I just use my online banking facility as if I making a payment in the UK?
I would suggest using ukforex I have been using their Australian equivalent for a long time; better exchange rates, low, or no fees... You can now do this at Tesco.. they charge you 3 GBP for the transaction but i dont know how much you can transfer at one go.
It's 750 quid apparently. If the receiving bank is PKO BP in Poland, then you can transfer it through London - but I'd recommend a specialist moneyexchanging outfit. moneybookers seems to be highly recommended!