Pace, how on earth do you come to your ridiculous conclusion? Even the most perverse 'a rule is a rule' €urocrat shows more commonsense.
Of course a pilot with an IR(R) and an EIR can get airborne using the privileges of the IR(R) in UK airspace, then use the EIR privileges when he/she needs to; for example, to join airways to fly to a European destination.
Similarly, if on your return the aerodrome is outside EIR limits - or even if it was before you left €uroland - you can use the IR(R) to fly an instrument approach at your UK destination if necessary.
How you can make such and absurdly tortuous interpretation is frankly beyond comprehension.....
