Some are much easier to believe than others. Finding empty tube carriages is easy. I think some photos are of Canary Wharf, which IIRC is deserted at weekends.
Side streets in Soho, and Carnaby Street? Again I imagine quite easy.
My office is off of Carnaby Street and I've seen looked down the length of it and not seen a soul. Quite common after midnight, although it gets a lot harder as soon as you step out to Regent Street or the Palladium.
Side streets in Soho, and Carnaby Street? Again I imagine quite easy.