A relative of mine is a partner in a company in Greece. The company needs to make an international payment to a company in Taiwan (10.000 EUR) for some equipment they purchased. They do have this sum but because of the capital controls the payment must be approved by a special committee and this will take far too much time. I live in the UK and I happen to have this sum and I'm willing to make the payment on their behalf from my UK bank account (or using TransferWise if possible). They will transfer the same sum to my Greek bank account on the same day, so effectively this isn't a loan.
My concern is: am I going to have any trouble with the HMRC? Could the company have any trouble with the Greek tax authorities?