My opinion
The UK at around 15GW solar and multiple GW under construction,with both Labour and Tories commited to 70GW solar.
The UK is already hitting a solar duck curve of huge solar production and consequent summer price midday collapse.
I feel the wholesale spring/Summer midday prices ,or around it,will drop like a stone with such high solar,even with increases in demand,as most increases are from electric heating (ashp etc) that will be in the winter not summer.
The chart below show the duck curve from California,where solar is already being limited at midday.
I think a solar CFD would be very prudent. Kirk hill I think the opposite and prefer wholesale prices.