A bit of light cleaning

I know this isn't a canal boat, but I wanted to take a photo of this first. This is the inside of this and is a stunning, large space. Normally. At the moment, it's filled with a complex arrangment of scaffolding as the large light fittings are cleaned.
Noone knows when they were last done, but it's certainly not within the last 6 years.
We just hope there isn't a repeat of the classic chandelier cleaning incident in "Only Fools and Horses" ;-)