I’ve read that these blocks are equipped with lifts, which is what could be housed here, although I don’t see any winch gear or housings on the roof.

Intriguingly the left half of the ward (as from this view) doesn’t have the red wall tiling.

However, the provenance of this block is older than I thought:

"The lift rooms are on [these] buildings - if you look near to the nurses home (the straight block) [coming later in the tour], you can see a tower running up the side of the building. They are very close to where the block starts."

And they're not that modern:

"Those blocks were there in 1883. Ihave a plan from 1883 from the "Journal of the Royal Institute of British Architects". It also shows fences between each block. I need to scan it, there are a lot of interesting things on it.".

A set of plans can be found in the Cane Hill Project section of this website. These are from a later date and show these wards.

But for now, I pass Hill/Harvard and miss Johnson/Jenner wards completely - these are buried well beyond the view of the fence.