You misunderstand the rules. You can give what you like, and there is no tax to pay at the giving date.
The issue that MAY arise later is one of IHT on your estate; if you were to die within the next 7 years, the gift would need to be added to the value of the estate you left, which may increase the amount of IHT your executors would have to pay from your estate.
There is a tapering effect, so the proportion of the £10k isn't constant until you survive the full seven years, and in any event the value of the estate you have may be well under the £325k threshold, under which no IHT is due anyway.