There are houseboats with fully furnished single room, double room and triple rooms.
Students live in four-person suites, which consist of two double rooms (two people in each double room), and each suite has its own bathroom.
This is a double room which can take a cot, has facilities for heating baby food during the night and gives access to sanitary facilities at all times.
The charge for the single room is probably two-thirds of the charge for the double room.
The owner says that, if a double room is converted to a single room, the cost will be about £16,000 per annum.
It finds that he spent the night in a double room at a time when his wife was certainly elsewhere.
I was reliably informed by that hotel this morning that it charges £85 per night for a double room.
That is that the charge for a double room is never anything like double the charge for a single room.