All the examples he mentioned Google, himself and the Irish Stripe founders had to do the same for their startups.
Sadly in the UK all the current unicorn "startups" are a bit iffy: XTX (high frequency hedgefund), betfair (betting company), tripledot studios (Zynga like company).
Unfortunately mega success in startups doing soemthing innovative is non-existent in Europe and UK in particular. Mistral stands out to how exceptional it is to the rule, and the closest other one I can think of is BioNtech.
Sadly the highest expected route to fortune in the UK remains quant trading in finance. Including starting your own hedge fund.