No, I wasn't stirring but I see your point. The web site I took it from just says "What remains open" with no distinction between retail premises and businesses. Lets look at another way, this is a list of "Ordered to close" which is not a just list of retail premises. I would say that Canal boat hire bases comes under the Caravan parks / Sites for commercial use but perhaps Wyvern saw it differently.
Ordered to close
Restaurants and cafes (exceptions: they can offer food delivery and takeaway)
Workplace canteens (exceptions: canteens in hospitals, care homes, schools, prisons and military canteens, services providing food or drink to the homeless)
Bars and nightclubs including bars in hotels and members clubs
Hair, beauty and nail salons
Piercing and tattoo parlours
Caravan parks/sites for commercial use (exceptions: Parks where people live permanently or those used by people as interim abodes where their primary residence is not available)
All shops selling non-essential goods including clothing and electronic stores.
Community centres, youth centres (exceptions: Halls may remain open to host essential voluntary or public services such as food banks and facilities for homeless people)
Churches, mosques and places of worship (exceptions – they can remain open for “solitary prayer”, funerals with social distancing – the mourners two metres apart and for live streaming)
Cinemas (exceptions: live-streaming of a performance if the group of workers exercise social distancing)
Museums and galleries
Casinos and betting shops
Enclosed spaces in parks including tennis courts and pitches for football, bowling etc, and outdoor gyms (equipment could become contaminated by human touch)
Prisons in England and Wales are closed to visitors