The following guide is a suggestion, if you unsure if this is suitable, please check the best way to deal with postings by checking with your accountants.
If you want to keep the £1,201.11 charged to your client, and if the foreign exchange gain does not form part of your supplier statement, which we suspect it wont, as it's where you have managed a favorable rate from the bank since posting the invoice and paying it.
You could pay the £1,201.11 invoice out on your supplier ledger in full, and not post the foreign exchange gain to the supplier ledger, instead post a bank receipt to one of your firms nominals. The inflated Supplier Payment will then contra against the bank receipt for the foreign exchange gain on your bank rec.
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