Which type of ISA?

[AreNeepsSwedeOrTurnips]

I currently have just over £10k in a cash ISA and a little bit more in a Vanguard S&S ISA. My house sale is about to go through so from April I'll have enough to put the full £20k ISA allowance for 25/26 somewhere.

I'll likely need to money in about 5-7 years time for school fees.

Would you put the full amount into the S&S ISA or split it? I am a bit risk averse but equally need the best return possible (as we all do!) as fees are going to be a pinch once my third DC reaches secondary school age.

I'm a higher rate tax payer.

I would split, as I think the next few years could be rocky and as you want money for 5 years time that timescale may not be a little short. Look at your overall cash position and how easily you can change plans should markets not be favourable.

Thanks @nannynick

That's my gut feeling too. I just gave middle of the night "why are you so afraid of the market?" worries.