So, a bit more information on the setup...
The water pump and shower pump are 240v. The bilge pump (manual only) is 12v via the starter battery.
There are 4 leisure batteries (gel) that are paired to create 24v. Each bank has its own battery charger for when on the grid, and a 24v alternator when not. A 2nd 12v alternator services the starter battery.
The inverter is a Mastervolt mass sine 24/2500. Lighting, sockets, hob, microwave, water and shower pump are all 240v.
A stovex stove provides heating.
The boat is gas-free, which I figure would need to change before any long term cruising (cheaper than a diesel cooker etc?)
Pretty sure I would prefer 12v as well, but guess we will have to see have it all performs post purchase (assuming we do purchase!).