Any advice on typical investor equity structures in the UK?

Hi team, looking for any advice on 'typical' investor equity structures in the UK

I have read in the Stanford primer and elsewhere that in the UK it's common for the majority of investor equity to be in redeemable, non-participating pref shares (i.e. effectively subordinated debt), is that correct?

Do investors still gravitate to the 20-30% equity for the searcher? Is it possible to get a significantly higher equity % for a self funded search?

Thank you!