w.r.t Britannia's MCC, it is definitely part of the Initial Type Rating. I know because I am right in there. As for the DEPs who did an MCC at Jerez, I think you will find that it took place in 2001 as a trial with a pair of guys.
It was, I believe a JOC course which so far hasn't been reconducted for reasons I am not aware of. Perhaps future training courses will do it, perhaps they won't but what's certain is that no one did in 2003 (and we are far from being all type rated on the 75).
On more general terms, after 911, I did an MCC at Multiflight with the great Alan Calder thinking this would help me get a job.
Well, mixed feeling here really.
Next job I landed in December 01, no MCC was required (Beech 1900, two crew Ops).
Following one, Air Taxi single pilot.... No MCC required.
Interview and Sim ride with BA Citiexpress... MCC required.
Interview and Sim ride with BMI Regional..... No MCC required.
and finally a job with BAL.... No MCC required.
Did I waste my money ? Well I could do with less debts today but at the time, it appeared to be the best option available whilst waiting for the Afghan War to take place, Major Airlines to go bust and god knows what what else we all feared could/would happen.
As usual in this industry, there is no clear cut answer. Might help some then again it might not make the slightest difference for others.
As said in a previous post though, if you do it, do it not just for the tick in the box but also for what you might learn from it.
Cheers