The UK imports a bunch of this cheap nuclear electricity from France, we have a 2GW bi-directional line. In principle that line could sell power from our gas turbines in mid-winter if France needs the extra power to keep things running, but most of the time it imports French nuclear power because it's much cheaper than our gas. Our own nuclear fleet is too small for our base needs (6-7GW of nukes compared to ~18-20GW base)