pay tax on investment profit?

[Doryfish12]

Hi, I invested a few hundred pounds into a company , its made £1200 in profit, I've withdrawn this, left the original investment in there.
Do I declare it? if so , how / when ?
TIA

It’s not CGT. The original investment is still invested. The asset has not been sold. So this is income I would have thought.

iI could sell whats left, not particularly bothered keeping them now...??

If it’s shares you bought and you have just sold some of them, then you have not ‘taken all the profit’. Your gain is the difference between your purchase and selling price.
You can make £3k capital gains per tax year (England) without tax due.