What I forgot to mention in my previous post;
For those with the MPL issued and completed the Easy Access rules details the required additional training to obtain a conventional CPL and IR, it effectively amounts to doing 50% of the Integrated course content (which is pretty much what Parkfell has stated above).
However the issue for some of the recent MPLs is the MPL wasn't completed, there appears to be no formal guidance at the moment on how an incomplete MPL can be cross credited to a Integrated or Modular and again it depends on the what stage in the training was reached.