The Help to Buy: ISA is a cash ISA. You can subscribe your ISA allowance into a cash ISA, a stocks and shares ISA, an innovative finance ISA and a lifetime ISA or a combination of the four each tax year. Santander do not offer innovative finance ISAs or lifetime ISAs.
https://www.santander.co.uk/personal/savings-and-investments/isas/help-to-buy-isa

