I have been asked to reply.
The information requested falls within the responsibility of the UK Statistics Authority. I have asked the Authority to reply.
Letter from Stephen Penneck, dated 29 January 2010:
As Director General for the Office for National Statistics, I have been asked to reply to your recent Parliamentary Question concerning what information the department collates on the (a) number of businesses in and (b) annual revenue of the independent hand car wash sector (312694).
The ONS does not collect information specifically relating to the independent car wash sector. This industry is subsumed within a larger industrial classification, which is 'Maintenance and repair of motor vehicles' and estimates of the number of businesses and their revenue can only be produced for the aggregate.