To add to Nige's post:
- The amount of CAT payable on your inheritance is already decided. It is based on a valuation of its value at date of death; if the bulk of the inheritance is the property, the liability should be nil.
- If it is sold at a later date for a greater amount, there may be a CGT liability, calculated over the period from date of death to date of sale (which is the period of your beneficial interest).
I cannot envisage any scenario where a gain in property values might be wiped out by tax changes.
Whether you are wise to make plans based on a hope of property values rising in the short-to-medium term is another question, and I think you should give it some thought.