You could check to see if there is 12v at the plugs when you activate the screen wash button. That'll give you an indication of current or duff motors and then go from there.Yes i know, that’s why it feels strange two pumps to have broken at the same time. When you pull the lever water comes out from both pumps the windscreen one and the headlights one, there is no pump noise whatsoever so it feels weird both pumps to be broken together.
I dont know on the l322 but the p38 headlight washer do not run every time you do the screen its after so many screen washes they will do one wash and if screen wash is low they will not work to save fluid for the main screen, so two stopping at once may be a red herring.
Tanya do a 110 amp that you can get on e-bay with a 5 year warantee for around £140, I put one in my 2004 3.0 diesel vogue and it has been superb. I read in th eoriginal owners manual that 95 amp was fine but there was an asterix saying up to 110 required if *additional extras and equipment ordered.Look up the correct battery for your particular L322, note its dimensions - including the layout of the terminals as in left hand or right hand positive - & then compare that to the one that's being suggested.
You could try tayna's site: Car Batteries - Motorcycle Batteries - Leisure Batteries - Cheap Prices! (tayna.co.uk)
MF31-1000 shows as L330xW172xH242, all mm.