Capital Gains Tax 84 - Date of acquisition
If you acquired the asset under a contract, the date of acquisition is usually the date of the contract. If, unusually, the contract was conditional, so that one or more conditions had to be met before the contract became binding, the date of acquisition is the date on which the last of the conditions was met.
Where there was no contract, the date of acquisition will be when ownership was transferred.
Now enter the date of acquisition and work out what the asset has cost you over your period of ownership; that is, the acquisition cost (reduced by any earlier claim to tax relief, if applicable) plus any incidental costs of acquisition and improvement costs.