As far as I am aware, there is no CGT on death, but you might have issues with Inheritance Tax. Assuming that your parents did not make any other gifts from their will, or made any significant payment from their estate within the last 7 years, there should be £650,000 (£325k x 2) available to take from the estate without paying any IHT (Amounts over that are taxed at 40%)
This is only intended as a guideline, and you should obviously seek professional advice on these matters. All the best!