By Adam Bloodworth Tom Holland’s adult stage debut in Romeo & Juliet, review and star rating: ★★★ Hollywood stars do the West End for cache: to show they’re serious actors who can hack the relentlessness of the stage after years in film – but it’s rare for young stars at the height of Tom Holland‘s megafame to tread the boards. The last young actor at his level might have been Daniel Radcliffe back in 2008 when he bared all in Equus midway through his Harry Potter career, but I’ve not seen fandom like this on the London theatre scene: the night I went, half the audience blocked Charing Cross R…