Back again. Eventually I managed to find a you tube Vid in Swedish about a 10k mile service for an env200.
It's is Swedish and I didn't understand much, but I'd guess he ( the refreshingly unglamorous Swede) may have been saying. " There's sod all to service except the air filter (no need to specify 'cabin' as that's the only air filter!) " I just about made out the bit about "tvo skrewe" when he showed the screws either side of the glove box catch.
His van was of course LHD but its a direct mirror for the RHD env 200. Mine does not have the passenger air bag so no need to remove the flap on the side either. The filter had not been changed for 4.5 years on my new to me van, replacement totally transformed the ventilation demisting performance.