M0YNG, 
According to https://www.carbonintensity.org.uk
9 of the 14 UK regions have a carbon intensity per kWh of generation of less than 10gCO2eq!
All of them are less than 45g, and four are 0 or 1!
The UK average isn't forecast to go above 90g in the next 48 hours (the forecast length)
