The current AEA per year is £12,300, You only pay Capital Gains Tax on your gains above the annual exempt amount.
For the tax year 2023 to 2024 the AEA will be reduced to £6,000 and then for the tax year 2024 to 2025 reduced further and be permanently fixed at £3,000.
This could cost up to £2,604 in additional tax per individual when selling asset in April 2025 versus selling in March 2023.