Hi Nelly070,
As you are married, you have the choice of splitting the gain 50:50 or 99:1 when calculating Capital Gains Tax.
There is a calculator here:
Tax when you sell property
Both of you should use the calculator to work out your respective gain.
If the calculation reveals that there is no tax payable by an individual, then that individual does not need to report their gain, they can keep a copy of their calculation for future reference.
If a capital gain is payable, then you can follow on from the calculator to register for a capital gains account to report and pay the Capital Gains Tax due.
Thank you.