British Gas is to increase prices for domestic customers from 23 November. The increase, which will affect nearly eight million households in the UK, includes an 8.4% rise in gas prices and a 10.4% increase in electricity prices. The company said it “understands the frustration” of prices rising faster than incomes. The average annual household bill will go up by £123. Rival SSE, which trades as Scottish Hydro, Swalec and Southern Electric, has already announced an 8.2% increase in bills from 15 November.