After having another read I see that if you are employed by a company with an in house approved checking system you IR is only valid for the company aircraft you fly, unless you have done a renewal outside of company with say an independent ATO...
So do you even get a private ops approval for IFR flight if you want to take the family down the coast etc...
If Casa makes say a C441 and B200 or even PC12 a separate type then they are not covered by a class renewal and a check in each is required over 24m. This is fine but we then need access to ATOs with type endorsements on all, or use a separate ATO for one or anther etc.