Steve. That's a Mk2 dash with Metro Instrument binnacle, these do vary with the various different facelifts of the Metro. The dash is simply held in place with 4 small bolts/screws and not bonded in at all.(if you look to the right of the switch panel and door seal in your photo you can just make out where the heads of the screws are, and it looks like that one has actually been taken out before and had another set of screws put in, four black dots) There is a 'shelf' that runs across the base of the dashes in each of the various Midas marks which does stiffen the tub but it's not the dash that does this.
It wouldn't be too difficult to make a dash from one variant fit another. I'm totally redesigning mine at the moment. If you're over this way , Blandford Forum, Dorset, then drop me a line and you're very welcome to have a look and a chat. I may enrol you in to the club proper though and hand you a copy or two of the club mag etc.