I think the posters question was if he has the enroute airway EASA rating which does not allow the flying of SIDS or STARS or instrument approaches but holds the UK IMCR will that not effectively in the UK only give him the same privates as a full IR albeit with IMCR instrument approach minima ?
But it was you who posted the question?
Neither the IMCr/IR(R) nor the EIR include privileges to fly a SID/STAR in Class A airspace. The IMCr/IR(R) does not include privileges to fly IFR in Class A airspace and the EIR does not include privileges to fly
any SID/STAR - even in VMC.