We do have a few catalogs in the archive https://www.retrobike.co.uk/archive/categories/ridgeback.437/ but it looks like yours is a bit older, already End of 80ties I would guess.
@boy"O"boy has posted once an review of 1989 portfolio
and there are somewhere in the Forum a few pictures of an 1986 brochure,
maybe still helpful, but maybe yours is in terms of age somewhere in between 1986 and 1989?
Great thanks! Enjoying learning about themThat’s mid 80s. I have an 89’ 602lx hangin up in my shop, my very first MTB. Not a huge expert on the earlier models but I’d put yours at 85/86ish.