Estimating / Calculating Dividends on Acc. units and ITs

tigerspill

Hi,

I am trying to calculate the notional dividend income as accurately as possible on some accumulation funds and investment trusts.  This is to try and work out my tax position as accurately as possible for this 2024/2025 tax year.
I totally appreciate that dividends are reinvested on acc units, but there is still income tax liability.  I also realise that some income is still to be paid in the next three months of the tax year.
I am really struggling to find the right information and to understand how to do this with a reasonable degree of confidence. 
The investments are held across Fidelity, iWeb and Vanguard platforms as follows.  I have given what I think are the notional unit income values to use but don't have confidence in these.  It doesn't seem easy (maybe not even possible) to get this information from the platforms.  
The reason I am doing this is to try and assess how much I can withdraw from a pension without paying tax so waiting until the new tax year wont work for me on this - hence trying to work it out as best I can.

Fidelity - Capital Gearing Trust (CGT - GB0001738615) - 78 pence per unit paid.
Fidelity - Personal Assets Trust (PNL - GB00BM8B5H06) - 5.8 pence per unit paid to date and an expected 1.4p in March 2025.
iWeb - Vanguard LifeStrategy 40 (GB00B3ZHN960) - £4.0727 per unit paid.
iWeb - Vanguard LifeStrategy 80 (GB00B4PQW151) - £5.6868 per unit paid.
iWeb - HSBC FTSE All World Index C Acc (GB00BMJJJF91) - 4.9134 pence per unit paid.
Vanguard - Vanguard LifeStrategy 80 (GB00B4PQW151) - £5.6868 per unit paid.

On Vanguard, I can see the following under "Corporate Actions" for VLS 80 - but am not sure the date to use to ensure it is in this tax year as some are in last tax year - do I use the "Effective Date". This is where I got the dividend value from.

Respond by date:
Record date:	31 March 2024
Announcement date:	24 May 2024
Expiry date:	01 April 2024
Effective date:	31 May 2024

I used to get the values for
 - CGT from https://www.dividendmax.com/united-kingdom/london-stock-exchange/investment-trusts/capital-gearing-trust/dividends
 - PNL from https://www.dividendmax.com/united-kingdom/london-stock-exchange/investment-trusts/personal-assets-trust-plc/dividends 
 - VLS 40 - https://www.fidelity.co.uk/factsheet-data/factsheet/GB00B3ZHN960-vanguard-lifestrategy-40-equity-acc/dividends
 - VLS 80 - https://www.fidelity.co.uk/factsheet-data/factsheet/GB00B4PQW151-vanguard-lifestrategy-80-equity-acc/dividends
 - HSBC FTSE All World Index - https://www.fidelity.co.uk/factsheet-data/factsheet/GB00BMJJJF91-hsbc-ftse-all-world-index-c-acc/dividends

Am I using the right values from these sites?

Any help appreciated.