In reply to Robert Lavin:
I looked into all this last year and kinda discovered this.
MBLA (which was the Scottish one) will cease as such as it's being merged with the BC Awards but it will continue to be recognised. At the moment, I'd say the MBL is the most demanding of the awards with the TCL being around the same level as the BC L2. But there will be a BC L3 at some stage and this will in theory be more demanding again (with some differences in content too).
Seems TCL will be accepted as a pre-requisite for the L3.
So if you want it right now and want as high a level as you can get - go TCL then MBL. If you can wait a bit perhaps do TCL and watch and wait.
I realise this is a mega complex subject and that's a simplistic over view, and there are other awards MIAS and CTC for example, but quickly narrowed it down to these two.
Hope that helps?