why CI data different to that given by Electricity Maps

[mkbane]

Sorry if this is covered but couldn't find why why this site has different values for “current” CI than app.electricitymaps.com? e.g. see screenshot (the electricitymaps seems less up to date (8am not 11am or even 11:55 when I looked data) hence I hovered over same time for CarbonIntensity.org.uk

example (EM gives 211 gCO2/kWh whereas this site gives 166)