Erm, because you don't get a say? It will undermine democracy. 

Hailed as a 'Devolution of Powers' from Westminster  each devoluted Region or Combined Authority will have a Mayor, who would be ultimately held accountable and responsible.   Why is one person to be a scapegoat for the decisions of many?

As an example, lets look at a South Yorkshire Combined Authortiy:

http://www.bbc.co.uk/news/uk-england-south-yorkshire-34414584

http://www.thenorthernecho.co.uk/business/news/13720289.Fears_grow_for_2...

"FEARS are growing for the future of 2,000 North-East steel jobs after SSI in Redcar missed a series of debt repayments.

SSI, the Thai-based owners of the Teesside iron and steel works, has been hit by falling demand for the steel, with prices for the commodity plummeting 40 per cent in the last year as a result.

The Twonks had promised the UK a referendum on Europe by 2017 - IN or OUT of the EU  - thats less than two years away, as if there isn't enough mess from the last five years to sort out ... mebbe Cameron wasn't expecting to win and the pages on his diary were deliberately left blank ... perhaps he was considering his very own  grande depart  ...  but hey ho it would seem that the French and Germans have already made plans for 2017  that may just slightly get in the way  .... 

The SN has escalated the controversial decision on the Town's Cinematic Future into a political 'story' with its front page and leading story:

http://www.thescarboroughnews.co.uk/news/local/cinema-wars-north-bay-vs-...

Is North Yorkshire about to become the Potash Power House of the world?

The York Potash application is in its final stage of approval for the worlds deepest Potash mine.

The Boulby Potash Mine has repeated its stake in forging ahead with its £50 mil expansion plans.