Ok, so I have now tried to get my head around how the fees work, looking at ii, Vanguard and Nutmeg.
It seems that in each case there is a fee charged by the platform, and fees charged by the funds you invest in. The fees charged by the funds you invest in seem to be called OCF (ongoing charge figure). Is that right?
For the platform fees
- ii is a flat £9.99 per year, which gives you an ISA account as well as a general account. So for £5k it would be £9.99 and for £20k it would be £9.99.
- Vanguard is 0.15% per year of the amount invested. So for £5k it would be £7.50 and for £20k it would be £30.
- Nutmeg (for the "socially responsible" option) is 0.75% per year. So for £5k it would be £37.50 and for £20k it would be £150.
So Nutmeg is very expensive, Vanguard would be cheapest if you had less than about £7k to invest and otherwise ii is by far the cheapest. Is that also correct or am I missing something?
I don't see any reason to use Vanguard as the platform if you can buy into the same funds on the ii platform for cheaper, unless you are investing less than £7k.
Then for the fees associated with the funds - they seem to vary between 0.20% for that Vanguard ESG index fund, and an average of 0.86% for the funds listed in the ii "model portfolio". And Nutmeg gives a figure of 0.32%. But do I actually need to pay any attention to any of these? It seems that I can't really compare them like-for-like because a fund with a high OCF might generate higher returns overall, so I am not sure what useful information I can extract from this figure.