In my opinion, factory rust prevention on omega isn't even as good as carltons (which i drove for 18 years prior to omega and did all work on myself ,bar the MOTs ) LCs had the plastic body kit which did trap water , so rust proofing is worth the time and effort (many will disagree
)
A cheap way(what many do on OOF) to do the belt is to buy 2 sets
clicky link2 sets because you need 3 roller bearings and re-use your original back plate
IF your roller bearings are ok,no wear ,you could just buy a gates belt about £25 (5453XS belt) trouble is you won't know the condition of rollers until you have it in bits
unless you have a receipt proving the entire kit has been done (and that still won't prove it actually got fitted ,yes i am a cynic
)
a complete gates kit is £120
clickythis kit K015453XS
£40 clicky says for a 2.5 but gives a gates belt and rollers (stock image on listing,not pic of correct actual item ) so a real bargain (if not sold by the time you read this)all the V6 belts are the same, but 2 types of backplate exist (but you can use your original being a non wea item)
probably cheaper brands available than gates ,I just use gates on all our cars because vauxhall did (but put them in white boxes with a GM and Vauxhall / opel part numbers on the box
)
I've got the locking kit you can borrow ,probably other members of OOF nearer you may have too
it's a complex belt set up ,so best not done by an inexperienced local garage ,there is an official OOF dvd on doing the cambelt
you could chance the belt being ok if not many miles , how many years has it been ?
surface rust on brakes will soon go being an automatic ,unless it's deep rust/original discs etc
air con recharges have gone up in price recently . ATS often have a voucher code discount in summer ,worth looking out for