I did the MEP/IR before CPL.
This was mainly due 2 ****e WX in Leeds.
Started with 3 hours MEP and 150 TT no IMC
The IR is bloody hard work which ever way you look at it.
You still have to do the IR bit on the CPL test even if you already have the IR.
I also did the CPL test in the twin which is much easer than doing it in the single after 55hours in the twin/sim. Three circuits with engine failure is just not an issue after the IR in comparison to glide approaches and PFLS in a complex single.
MJ
And i agree with WWW about blokes failing before they even sit in the cockpit with the CAAFU. If your not dressed the right way or look the part, your on a sticky wicket before the engine's even start.