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Unfortunately you do, to reflect the periods it was let out against the overall ownership time.
Take the full ownership time in months (A). Take the let time ditto less the last 9 months of ownership when you are deemed to be in residence even if this is not the case (B). Now express B as a percentage of A and that will be the proportion of the gain exposed to Capital Gains Tax (CGT) which will be levied at 18% or 28% or a combination of the two rates depending on your income including the gain in the tax year of disposal. You nave a non cumulative Annual Exempt Amount (A)A) of 12.3K to offset any gain.
I have shown you how to calculate the CGT payable, if any.
Put the A / B figure and multiply by 100. That will give you the percentage.
Exactly what it says basic school arithmetic. I was taught it when i was 6.
I can only suggest that you gat a neighbour or friend to do this calculation for you.