I have no idea about the energy situation in the UK to be honest. But I have to admit that IMHO wind-power is not a solution in any case. It might be from the engineering point of view. But it really ruins the nature, visually. It's so shocking to see all those towers and propellers in certain regions here in Germany. It seems we need a very different approach for the future. Especially for a modern country with 83 million people. In the media they often say that almost 50% of electrical power already comes from renewable sources. But one has to look at the primary energy consumption, because renewable sources is only about 15% currently. I'm no expert, I don't know all the numbers, and I have no idea yet. But it just seems to me that there is a gap between the fiction of renewable energy and reality.
Remember that primary energy only made sense in a time, when most energy was produced by oil and coal and allowed a good representation of the imports. But now, you should pay more attention to the usable energy.
The most modern and efficient coal powerplant only turns about 27-28% of the primary energy it consumes into electricity, the rest is waste heat that has to be dissipated by the cooling towers. Presenting graphics with primary energy of old steam engines vs renewables is a common fraud in the anti-renewable movement. For example, if you correct the nuclear primary energy of france to show the usable electrical energy, the available power generation looks far less impressive. All renewables are operating at nearly 100% efficiency there, even old hydropower plants reach well over 95% efficiency, they have no huge waste heat production that wastes the available primary energy.
Theoretically, our 100% renewable primary energy case should be 20% of what we consume today, by plain efficiency difference (Thats 730 TWh electricity, the estimate of the German goverment for 2030 is only slightly higher at 800 TWh). Even heating houses with heatpumps is way more effective than using a oil or gas burner. It isn't really about "Can 100% renewable be done?", the real challenge is: How can we do this? How to invest for maximum ROI? What powerplant should be replaced next, how much replacement production is needed for this region? Can the powergrid handle uneven distribution of loads or should a more effective powerplant be replaced first for the sake of minimizing costs for powerlines? How to motivate people to replace old stuff in their basements with something better?
Also, without renewables, we would need to build 85 nuclear reactors in a short time (And get the needed number of operators). So, even if you would like a nuclear option, without using the available renewable potential, it would be really unaffordable. (Thats 3.5 trillion Euros at the current price tag)