Check out Brighton and Sussex for some virtual work experience. You do not have to complete clinical work experience, unis understand you may not have the chance due to COVID. Instead you can work in retail or something which can help build up skills that you can talk about in your personal statement and interviews. Volunteering in charity shops or care homes can also be helpful.
Most medical schools don't really care what sort of volunteering you do, as long as you can talk about what you have learnt/gained from it during interviews and personal statements.