You are too gracious Simone, I've just tried to read Franz's post. The last thing it is, is 'eloquent.' Rambling, Tedious, Verbose, yes, but elequent no. I gave up half way through it and I'm not revisiting it.
I first heard of the GMSF when the AGMA constitution was finally passed, which was in 2008. So yes, you are correct, it has been around a long time. The fact that Franz has just heard about it says little for his informed opinion. You have said in three words what Franz has been unable to say in three hundred. It is exactly that, the 'urbanisation of Marple.'
As I'm sure you know, whether it goes ahead or not will be outside the influence of the people of Marple. Council's take little or no heed of consultations . They are usually collated and processed by the most junior clerk and council leaders rarely look at them, they are just a tick-box exercise in the process.
Just to throw something else into the mix, Andy Burnham, the Combined Authority Mayor elect, is on record as saying that any/all houses built on greenbelt should be social housing. So in theory we could see a 4000 house council estate appear gradually in High Lane.