Two events last week spoke to the stark dichotomy between the UK and Ireland’s tech ecosystems. On Friday, Revolut took over the immersive Outernet event space in Tottenham Court Road in central London. The fintech hosted singer Charli XCX and its chief executive Nik Storonsky sat down with Dragons’ Den and Diary of a CEO star Steve Bartlett to celebrate a significant milestone: the nine-year-old start-up now had over 50 million customers. It marked a stunning transformation for Revolut, which began its journey with two hot desks, one for Storonsky and the other for co-founder Vlad Yatsenko, in the Level39…