Capital Gains on half of inherited property from a few years ago

Hi, I recently inherited my parents property on the passing of my father. My mother passed in 2017, at which point her half of the property was placed in trust for me and so that my father was able to live there until his death. For the Capital Gain on the half I already owned in 2017 I assume there will be capital gains. Which capital gains allowances am I able to use to calculate the tax required to be paid? Many thanks Marc

Hi,
For further guidance please use the link below:
Capital Gains Tax: Work out if you need to pay
Thank you