If you pluck up the courage to unlock (with your BW key!) and open the unmarked door, and can negotiate the wet and slippery floor, you'll come across this:
One of three cubicles containing a toilet and a cold water tap and sink but no hand drying facilities. If nature calls after the hours of darkness, please note that the building is not only unlit - but appears to have no means of interior illumination whatsoever!
Nicholson's Guide mentions a water point. Its not obvious - but eventually I found it:(Its the tap half way up the wall on the right in a room which presumably, in the absence of any other facility is used by boaters to empty their chemical toilets!) And that's Worsley sanitary station - a fine example of go-ahead, thrusting, customer-focused private enterprise!
OK, so BW's not perfect, but compare this to a typical sanitary station found on the publicly-owned network (let alone the superb clean, warm and well-lit facility at Norbury Junction with disabled loo and free showers).
Mind you, some people just won't accept that sometimes BW gets it right. Commenting to a fellow boater who'd just finished taking water from the tap in the toilet I said something to the effect of "Come back BW, all is forgiven") He gave me a strange look and said - slowly - "some of theirs aren't up to much neither". But then, according to its signwriting, his boat is based on the Barnsley Canal and as this closed in 1953 perhaps its not surprising if British Waterways is limiting its spending on providing facilities for boaters there at the moment.