Short selling and 30 day rule


I have shares brought many years ago. I'm now thinking of short selling them to realise a gain. Example :
1000 shares, sell £10
1000 shares, buy 2 days later £9.50
Repeat the above as and where the price warrants.

I read info on the 30 day rule and bed & breakfasting. I understand any gains will be subject to CGT allowance and any lost will not. Is this interpretation correct?

If I later decided to dispose of the shares the gain will still be based on the original purchase price (from years previously). Is this interpretation correct?
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