-
Ground works, connection to services (water, electricity, sewage), etc. They also have to be pretty robust to be vandal/drunk proof. Add on a cleaning/servicing contract, etc.
Gavin Odolant-Smith, manager of the nearby Crown and Crooked Billet pub, said: “It’s funny because the drivers still use our toilets.”
Unsurprising that drivers will use the pub's toilets when the pub is open, but the pub isn't open for the entire time that the buses operate, hence the need for them.
There's one nearish me that's been there at least 5 years: https://goo.gl/maps/EQbStku69D52
Given how picky the neighbours are around there I'm sure there was a lot of NIMBYism and objections.
House price fears after bus drivers shit in boxes:
https://www.standard.co.uk/news/transport/anger-as-another-turdis-pops-up-in-london-with-no-local-consultation-a4050311.html?amp