Can you help with the balance transfer fee?

[positively9something]

I have seen a new credit card for balance transfers it is 0.7% transfer fee and 0% for 18months!

If I transferred a balance of £3000 I have worked it out that the transfer fee would be £21 is that correct?

0.7% of £3000 would be £21. 7% would be £210. Make sure you've read it correctly and the decimal point is in the right place :)