I ended up going a few times last year - a short walk from wfm / Picadilly tube it's convenient for grabbing something cool in hot weather (which does happen occasionally in London). It's also an alternative dessert destination after visiting somewhere like Beatroot around the corner that doesn't really do pudding.
As is often the case at such places it's the sorbets that are vegan rather than icecream. It is good quality sorbet though, so you won't feel too hard done by. Cross contamination's a definite possibility so it's worth staying vigilant whilst they're serving your order - I've heard from other vegans that they've messed up in the past.
Their churros are good, but like most places I was told the chocolate sauce isn't vegan. Thus I've opted for chocolate sorbet instead when I've had them:
I like Scoop. It's one of Soho's better places. Vegan icecream, toppings and better separation would be very much welcomed in the future, unless someone opens the London branch of Lula's Sweet Apothecary here in the meantime!
I like Scoop too, I've never tried the churros though and I like the idea of having them with gelato!