Indeed in the 1971 Act there are several sections refering to houseboats - the summary could be "The authority can set any conditions it wishes and charge whatever it wants"
Eg section 14
Whilst C&RT do not particularly like Houseboats they find it a useful method of getting rid of CMers, as if it is a non-navigable boat it is a Houseboat and C&RT can set any terma and conditions they wish - making it unpleasant' for the owner.
I had some long discussions with Nigel Moore on this subject, and one of his thoughts was .................
NM : The whole “houseboat” issue is one which CaRT have very mixed feelings about. On the one hand they would be happy to dispense with them altogether – and have allowed them to be whittled down to 80 or less at last count I know of – because of what they see to be onerous obligations over security of tenure and the legal requirement to pass on the benefits to subsequent owners - yet they find it useful to arbitrarily re-classify any pleasure boat as a houseboat for the purpose of s.8 litigation.
However absurd the result, it ties in neatly, for them, with the messy definitions within the 1971 Act, wherein houseboats are classified as [inter alia] anything that is not bona fide used for navigation. Hence, on their argument, once a boat can be said to no longer being so used, it becomes a houseboat – automatically non-compliant with the mandatory T&C’s applying to those. All a bit clever when you stop to analyse it.