Hmm... At €13000 (plus €2000 for expenses) for an MEIR with Aerodynamics, I'm not sure it wouldn't be a bit of a false economy to do SEIR first, only to upgrade to MEIR at a latter date.
Another hint, FWIW, by doing the IR first in Spain (i.e., cheaper) then doing your CPL back in the UK you will save a significant amount of money, as you don't need to do the instrument flying part of the CPL (so only 15 hours required), and you can do it on a single. Overall, you MEIR+CPL should not cost above €20,000 inclusive of living expenses. I know the Euro is quite high these days (if you earn your bread in Sterling), but there you go, just some food for thought.