The Conservative government had planned to introduce a British ISA in tax year 2024/25.  It would have provided a £5,000 allowance in addition to the current £20,000 allowance, with the contributions made to this ISA being invested in British business.  You would therefore have been able to allocate up to £25,000 per year across your ISAs.  The new Labour government has, however, decided to scrap plans for the British ISA as they “are not planning to complicate the ISA landscape even further”.  More details are available in this Yahoo Finance article.