每個type 1個tax year只可以一個 但可以開多過一個type
加埋唔過£20000 (Lifetime isa £4000)
https://www.ajbell.co.uk/isa/multiple-accounts
How many ISAs can I have?
Each tax year, you can split your annual ISA allowance of £20,000 between the different types of ISA you’re eligible for. That can include a Stocks and shares ISA, Cash ISA, Lifetime ISA or Innovative Finance ISA.
Just remember – a Lifetime ISA has its own limit of £4,000, which sits within your overall allowance.
Over time, you could easily end up with many different ISAs with different providers, even if you stick to the same type of ISA. There’s no limit on the number of accounts you can open in your lifetime, but obviously the more accounts you open, the harder it will be to manage them.
How many ISAs can I pay into each year?
Though you can have multiple ISA accounts, there’s an important rule you must be aware of:
You can only pay into one ISA of each type per tax year.
For example, if you’ve already paid into a Stocks and Shares ISA this year, you can’t open and pay into another Stocks and Shares ISA with a different provider until the new tax year. You should be especially careful about this rule if you’ve a regular payment set up into an existing ISA account.