CNBC reports that Boris Johnson’s Conservative Party has convincingly won a byelection in the northern English town of Hartlepool, cementing its strong footing across working class areas of the country that once belonged to the rival Labour party.

Jill Mortimer beat Labour’s Paul Williams by nearly 7,000 votes, according to the count announced on Friday morning, and became the first Conservative to win the seat since the constituency was formed in 1974.

By-elections happen in Britain when a seat in the House of Commons becomes vacant in between general elections.

The win will be seen as a barometer for the current mood in the country as it slowly reopens after strict coronavirus lockdown measures. Johnson was heavily criticized for the initial response to the pandemic, and with over 127,000 reported fatalities, Britain has one of the worst death rates in Europe and the world.