After forty years plus of holding military and civil instrument ratings I have elected not to hold a UK IRR(IMC) qualification as it is no longer relevant to the flying I undertake - if the weather is not good enough then I'll have a coffee on the ground. Whether this is the right thing to do I will leave to others to judge.
What does worry me however, is the attitude that some private pilots have to their shiny new IRR which they use carte blanche to fly light aircraft for prolonged periods in serious IMC conditions - usually in aeroplanes which are not designed for such conditions with no autopilot or icing protection. I never hand flew large jets in IMC, thats why we had multiple autopilots. Currency and practice is vital.