not many places will pay for your MEP/ IR. at best you may get a type rating but thats it. if you intend to go into air taxing or somthing like that the companys are usualy small and dont want to invest in training other than what they have to (ie aircraft checkout).
do a 1st class medical before you start anything as if you fail that and you have started training alreaady you will have wasted all that money.
before you start you CPL you will have to do your ATPLs theory and your 150 hours hours building. to get a uk CPL you will need an ICAO ppl so make sure whatever you do is accepted where you intend to carry on your training and also where you want to work.
if you intend to go into the jets at some point you will have to make sure you finish you IR before your ATPLS expire (3 years after your last exams i think)