Reporting a gain in advance

I regularly sell shares and report gains on my annual tax return. I have just sold shares far in excess of the quantity that I usually sell. Should I inform the HMRC now to avoid having to answer questions when I submit the return?

Hi Dave,
You can use the 'real time' Capital Gains Tax service, to report and pay Capital Gains Tax.
Report and pay your Capital Gains Tax
If the combined total of the shares disposed of is below £50000 and you use the RTTCGT service within the allowed time, you do not need to include on your self assessment tax return.
Thank you.