Is there something called "RBWM Alternative Learning Provision" here or near here? It's meant to be a school but it's addressed at Maidenhead town Hall & the school's website suggests it's actually based in Haybrook College (nr Burnham Station), which has a separate edubase ref.

If nothing then the businesses here could do with a new survey anyway, and this can be left as a mystery school for someone to add on their own volition (ie without there being a note).

The map for this school shows it as being exactly where this note is placed:
https://get-information-schools.service.gov.uk/Establishments/Establishment/Details/131596