Choice of investment funds - SS ISA

[Nothernsoulfood]

I have about £20K invetsed in the following funds. I started investing in 2020 drip feeding a small amount each month. I have an anualised growth of around 8.5% and growth since inseption of 25 percent. This seems very avergae. But again I am fairly risk adverse thus no very risky funds or individual shares. I was after opinions on the mix of funds I have, should I be doing anything differently.
Currently I have a UK biased.
Thinking I should put some money into a S&P 500 tracker?
iShares 100 UK Equity Index Fund D Acc about £10K
Stewart Investors Asia Pacific Leaders B Acc about £1K
Vanguard LifeStrategy 60% Equity Acc about £9K

Too UK-centric, may be better with a global fund such as HSBC FTSE All-World Index Fund, growth over the same period of approx 70%.

Vanguard have unfortunately increased their fees for smaller investments (under £30k) so the £9k there might be better somewhere else.

Vanguard have changed their platform fee to a minimum of £4/month, but OP appears to be using Fidelity so won't be affected. I don't think Vanguard have changed their management fees for individual funds.