No.
Our biggest interconnect is with France which is 72% nuclear. Currently importing 3GW from them.
Our second biggest is with Norway which is 88% hydroelectric. Currently importing 1.7GW from them.
We're importing 0.2GW from Belgium which is partly gas and partly nuclear.
We're exporting power to Ireland, The Netherlands and Denmark.
Imports is 6-7% of current UK grid power. Most of our power comes from us burning North Sea gas.
[2] https://app.electricitymaps.com/map/live/fifteen_minutes