By relying on Jeppesen, you and your company are not alone in making a fundamental mistake as Jeppesen are NOT regulated either by ICAO or by any national aviation authority thus you are placing total reliance on a company which claims to regulate itself as regards aeronautical information.
What absolute nonsense. Jeppesen databases are highly regulated by aviation authorities. The database supplier is validated by the (E)TSO approval of the FMS or GPS, from an airworthiness point of view. From an Ops point of view, Jeppesen hold the Type 2 LoA for their database products from EASA and the FAA. From an Operational approval point of view, AOC holders' operations are approved by the NAA including reliance on Jeppesen databases and paper manauls.
It is utterly unrealistic to expect international operators to examine the minutae of every countries AIPs, AICs, Safety Sense leaflets etc etc. The normal practice in aviation is to use standard products like Jeppesen.
Having said that, I agree that the UK has a sort of quirkiness and non-standardisation (sometimes defended in an indignant way that implies the rest of the world is a nusiance for being out of step with the UK) which means an operator does need to self brief the big picture of IFR OCAS.