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You may* be able to rescue it with baking soda if there is corrosion on the terminals.
Disconnect the battery completely.
Sprinkle baking soda on the terminals and connections.
Put a small spritz of water on the baking soda.
Once it has stopped fizzing give the terminals and connections a bit of a scrub.
Grease with petroleum jelly or specialist battery terminal grease.
Let everything dry completely and then reconnect.
*This has worked for me in the past I cannot tell if it will help you but you try it at you own risk. Also eye protection is advisable battery acid in your eye ain't nice.
Bobbo-
Thank you very much - I'll have a look at the link (humour/potty mouth, what's not to like?). Battery terminals very clean tbh, no corrosion etc at contact points so I don't think that's it. I'll have a go at reconnect all fuses etc under seats, disconnect battery for 12+ hours and then new battery and hope for the best.
I'll update once I've done these three things.
Thanks again
Pasty_Spumante
Yeah; I'm hoping that is the case; also the battery tester showed only 9.8-10V on what's a 12V battery. The only thing that casts doubt is that it wouldn't start with a battery charger on 'start' mode.
Thanks for your contribution - see if I can borrow a neighbour's battery perhaps