Martin Lewis has urged customers of energy firms including E.On, British Gas, OVO and Octopus to switch their tariffs 'right now'. The money-saving guru issued the warning as gas and oil prices rocketed amid escalating tensions in the Middle East. Oil prices have climbed further as the Middle East conflict entered its fourth day , triggering stock market falls across the UK and Europe on concerns about a protracted war. Gas prices on Monday also jumped at their fastest rate since the Ukraine