30 DAY RULE... SECTION 104 HOLDING COMBINED WITH REPURCHASED SHARES

I have a Section 104 Holding and a few days ago made several disposals totalling 50% of the holding. If within 30 days I repurchase half of those sold I understand that the gain for CGT on these will be calculated using the recent sale cost as the acquisition cost. My question is....how do I then calculate the acquisition cost of my overall holding (ie the original 104 holding shares I retained together with the repurchased shares) Thanks

Hi,
Please refer to guidance using the link below:
Shares and Capital Gains Tax (Self Assessment helpsheet HS284)
Thank you