Ring up the bank there is a way of doing it as I have a client who does it all the time, on the bank statement it will show as GBP even though the transaction will be in Euros. Also there will be a bank charge for this, I don't know the amount as it really depends on the bank.
I do invoices out for services and tend not to key the invoice until its gone through the Bank account - then I know the exact rate used and can just key the invoice at this amount. Although I appreciate this is no good if it needs to be included in the VAT return before it shows in the Bank account - at which point it is perfectly acceptable to use the FT exchange rates and then do any adjustments later through a forex nominal code - as Amanda says -dont forget to split out the charge - the Bank will always send an advice of the rate used and the charges.
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Joanne
Winner of Bookkeeper of the Year 2015, 2016 & 2017
Thoughts are my own/not to be regarded as official advice,which should be sought from a suitably qualified Accountant.
You should check out answers with reference to the legal position