If gas is setting the price as the most expensive form of energy, then it acts as an incentive to build cheaper forms of energy because your margins are that much higher.
Alas, England doesn't allow on-shore wind power, and there's not sufficient capacity (in terms of HVDC lines) to transfer enough power from Scotland down to England to move all of the excess energy.
That seems like a good way to spur early development. I wonder, though — if consumers could actually see the cost benefit of the wind power, might gas have been just priced out of the system by now? (Or relegated to some backup status). (Supposing the transmission infrastructure were upgraded to allow for the higher flow, or England changed its laws to be more in line with economic realities).
Alas, England doesn't allow on-shore wind power, and there's not sufficient capacity (in terms of HVDC lines) to transfer enough power from Scotland down to England to move all of the excess energy.