brandburner Hi Brandburner! Welcome to the Crunch Chorus Community Forum! Glad to have you here.
Sadly I'm not an expert on this but I've just had a chat with our accountants and they mentioned that one of the options you might choose is investing the maximum amount of £20,000 in a tax-free ISA. It does sound like you'd benefit from speaking to an investment advisor who can help choose the right option based on your specific circumstances and your appetite for risk.
Hopefully the other forum members will be able to advise based on their own experiences!