Conservatives face critical by-elections amid UK's economic woes

The UK is holding three by-elections this week that could see the Conservatives lose all three seats.
The elections are fallout from scandals under former PM Boris Johnson's leadership.
Labour leads in polls as PM Sunak struggles with inflation, strikes, Brexit impact.
Potential Conservative losses would increase criticism of Sunak amid a stagnant economy.
Sunak has shifted from ideology to problem-solving but hasn't revitalized growth enough before elections.