If your total assets minus you total liabilities is more than  £4562.96*  Zakat will be obligatory on you.

*Zakat is obligatory on all Muslims who are in possession of surplus wealth for a full lunar year, exceeding the monetary value of 87.48 grams of gold, which currently stands at £4562.96 (last updated 2023-03-20 12:00:35). This value fluctuates slightly every day.
** Gold Price Taken from https://rapidapi.com/user/solutionsbynotnull