Well, after that initial misunderstanding perhaps I could share a few thoughts for other potential newbies.
It is as easy to use as Phil says. After a practice scoosh with some water, I was able to produce a smooth paint finish much quicker than with a brush.
With a piece of foam under the compressor to stop it going walkabout, it just emits a gentle buzz. Nothing to bother the neighbours.
Looks like pretty much every part is replaceable
https://www.shesto.co.uk/cake-crafting/cake-craft/spraycraft-sp30-sp30-cdk-airbrush-spares/
I prefer acrylics so used soapy water for cleaning but perhaps I'll try the Lifecolor cleaner.
Yes, cleaning does take a bit of time. I expect I'll have to make a pile of stuff to be done in a session.
I'll still be using my old brushes for weathering and fine detail. Plan is to use this for a good basic finish to my wagons and vans, and anywhere there's a large area that needs painted. No doubt other stuff too.
Graham