RE: Apologies, Off Topic Advice please :(30 Dec 2020 12:09
Sojourner - I find statements by you and wealthsimple questionable.
You say that you could, for example, invest £5,000 into a Cash ISA and then split the remaining £15,000 across the different types of ISA you hold. This implies to me that if you already hold Stocks and Shares ISAs which were opened in various years you could put say £5,000 into each of three Stocks and Shares ISAs opened in separate years in the past. I am sure that you cannot do this.
It may be that if your ISA Manager offers more than one Stocks and Shares ISA (for example one which concentrates on Gold Miners, one that concentrates on FTSE100 companies, and one that concentrates on Capital Growth) you MIGHT be allowed to split the £15,000 between those different ISAs because your ISA Manager can check that you haven't exceeded the maximum investment of £20,000 in that tax year, but if you hold Stocks and Shares ISAs with different ISA Managers I am sure that you cannot allocate part of the £15,000 to a different ISA Manager.
The words that I find confusing are "across the different types of ISA you hold". I don't want readers to think that they can do something which is in fact not allowed. If anyone can show that I am misinterpreting those words please say so.