Three contract SIM, which we still use, started at £9 a month in 2015, now £11 a month. inc. VAT, one month rolling contract; unlimited calls; unlimited texts; unlimited data, subject to "Fair Use"; tethering; free roaming in IIRC 48 countries.
Unsurprisingly, no longer available on those terms
That's why impounding the offending craft works; no necessity to identify the operator (driver) or fine them; craft unavailable for use and, if the offence has not been caused by the owner, a personal sorting out of the offender by the owner will ensue.
If you enlarge it to +500%, just before it loses definition, the photograph seems to be of a pool; there looks to be no channel or locks in the distance.
The "CAMRA" one will be the one in the listed in the GBG; "Nearby Pubs" are ones listed in the WhatPub database but are only GBG listed if marked with the wee orange symbol, if not they may or may not be to your liking; in that case you are on your own.
FYI; not in the 2021 Guide
Old Ship...