Loss/Gain Foreign Exchange Rates

[blamonz]

I sold something abroad, received payment in other currency and then transfered money to my UK business bank account. I converted it into pounds on the date of invoice (btw. the same day when I received money), then made a transfer to UK and received other amount as bank had their own currency rates. Hmmm...

Is that difference a loss/gain I should state in my self asessment?

Thank You for your advice.