Any shutdown would increase gas prices worldwide. Just because the UK doesn't use Russian gas direct, it does buy gas on the open market, when Germany can't buy it for €1 per unit from Russia, they'll pay €1.20 from the UK (which has 50% domestic production, Norway having most of the rest), pushing prices up for the UK and other countries despite not using Russian gas direct.

The failure here was the inability to boost nuclear and renewable sources in Europe over the last 8 years to reduce reliance on Russia.