Electricity bills will be higher in 2030 than in the wake of the Russian invasion of Ukraine, the boss of British Gas has warned, as the government pushes through major upgrades to the UK’s grid infrastructure. Chris O’Shea, chief executive of British Gas-owner Centrica, said the UK was playing catch-up after years of underinvestment, and now faced significantly higher costs. “We’ve underinvested in the system for many years, and whether it’s the cost of building a new gas-fired power station or a new wind farm,…