There's no such thing as 'gift tax' in the UK anyway!
You're free to give what you like, to whom you like and when you like without the tax man having the slightest bit of interest. The only exception is that if the donor dies within seven years of making the gift, some or all of the money might still be counted as part of the donor's estate when any liability for inheritance tax is calculated.
If you need to know the rules about gifts and inheritance tax, see here:
http://www.hmrc.gov.u...erty/exempt-gifts.htm
Chris