Hi
If it has been your only residence for the whole period of ownership, then it is likely that no CGT would be due as you would be due full private residence relief.
However, as a non UK resdient at the time of sale, you will still need to report the sale - see
Report and pay your Capital Gains Tax.
If your wife is still UK resident at the time of the sale and it has been her only resdience throughtout the owenership, she doesnt need to report it.
Thank you