Alan de Enfield

I think he means "floor joists"

And when you die, the new owner, who knows nothing about the boat, plugs in the shoreline and has a live 'wandering' plug. Apart from that - yes the rest will work fine. If the cable is going 'over the door' (as you suggest) ensure that it is in a channel, or thru the door frame, and cannot get squashed,

Your 13 amp plug (to be used in the inverter) could be extremely dangerous, as it could be live when you plug the land line in. Relying on remembering to change over the 3-way switch before plugging the shoreline in is fine - until you forget or ask someone to do it for you. Humans are failures waiting to happen !

If I remember the BSS section on 'mains electricity' is advisory.

Many marinas offering 'Residential' berths tend to have 32 amp supply - certainly BWML did (so I guess Aquavista) still do)

Recently installed a new electric oven/range which required a 32 amp supply - the installation instructions stated 6mm2 (10mm2 max) cable. The other question is what is the CSA of the shore line, I have not seen any commercial 6mm2 ones and have previously had to make up my own. Edit to add : Found one £128 + postage (20 mt) 32 Amp '20 MTR' 3 Pin Extension Lead 6mm² Heavy Duty Industrial Rubber Cable HO7 | eBay UK

Diesel floats on water. From my boat diesel tank.

Are they automatic bilge pumps (maybe they were originally but have been changed over the years) ? I know you have changed them but - Is the float seized up with oil/grease, rust, a leaf etc etc ? If it is stuck in the 'down' position it will not activate automatically, but will manually.

NO - as Tony explained earlier, this is 'surface charge' sitting on the plates. You either need to wait an hour or two and then measure the voltage, or, turn something on for a few minutes to 'use up' the surface charge.

A 70 amp alternator does not charge your batteries at 70 amps. In many respects having a bigger alternator is a waste of time (if you have FLA batteries). The batteries dictate what charge they will accept and typically when re charging you may get : 50 amps for the 1st 15 minutes, dropping to 30 amps for the next hour, dropping to 20 amps for the next hour, dropping to 10 amps for the next hour and then 4 or 5 amps for the next 4 or 5 hours. The size of your battery bank and state of charge dictates the charging current. When your batteries are (considered) full you will be charging at 1% to 2% of tha battery bank size, so if you have 2x 100 Ah batteries (total 200 Ah) when you are charging at 3 or 4 amps at 14.4+ volts and, it has not changed for 1 hour, the batteries are full If you have lithium batteries it is very different.