This was the closest to a homeless encampment in London that I know, in the corner of Hyde Park surrounded by the most expensive apartments and mansions in the city:
• Video Link
It's the traditional landing ground for the Roma / rural communities from Romania, and most don't sleep in tents but in a hidden tunnel to the expensive carparks underground. Yesterday I dragged two binbags worth of sleeping bags, groundsheets and pillows from work to donate there (many get left behind at sleepover events), but the entire encampment had gone, the tunnel locked, and none of the community to be seen. Perhaps the last straw was having the gall to put tents out of the summer heat, on that traffic island. Worryingly, no one had any idea what's become of them.
I even asked the tube staff outside, about 20m from that video spot, who thought I was talking about the one bloke who slept downstairs.
I did manage to find some Syrian refugees, all well dressed but cold, and only spottable because one had a blanket laid over the bench. They even refused the donation at the start.
The other 'hotspots' for the unhoused are around St Martin-in-the-Fields Church on Trafalgar Square, and by evening, the tents that will appear in nooks and office doorways around Tottenham Court Rd. Both areas are in chichi tourist routes, spotless let alone human-turd-less, and you wouldn't have a clue by day.