Switched my cash lisa from moneybox to tembo last year, have just initiated another 2 isa switches from trading212 and another moneybox isa to them. Next year i should be able to max out the £20k isa allowance and i'm thinking about opening a s&s isa. Not sure exactly what you mean by 'the funds are identical to an s&s isa ' but yes, the principle of any type of lisa is that, in return for the 25% bonus, withdrawal penalties.
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I've currently got about £35k in a cash isa.