NHS Contracts Negotiated Centrally

The Government is negotiating with a private company to develop new treatment centres in the North West region (Cumbria, Merseyside, etc), which might make existing NHS facilities unviable.
Why does the government have to negotiate these in London? Surely they should be negotiated in the affected region? Perhaps then Netcare would have offices in the region?
I hope that senior Department of Health staff aren't feathering their own nests, negotiating a sweet deal then (having committed the taxpayers' money) switching jobs to Netcare to reward themselves with the same taxpayers' money! It has happened!