After doing all this research I now realise that one does not need to report capital gains in the UK unless they are over the exemption of £10,900 (£11,000 next year). The gov website says:
You don’t need to do anything if you’re not registered for Self Assessment.
If you’re registered for Self Assessment [WHICH I AM] you must still fill in the capital gains section of your tax return. To do this:
-confirm that you need to complete the capital gains section in ‘Tailor your return’
-in the ‘Details of chargeable assets…’ page select ‘No’ for each question - you won’t need to report anything else about your capital gains or losses
Mine are under the £10,900 threshold so I will need to include the CapGains pages but will not need to submit all the wretched calculations etc. I think!