Personal finance guru Martin Lewis has issued an urgent warning to UK homeowners and drivers, pinpointing a crucial deadline at the end of May when energy price increases could escalate dramatically due to the ongoing conflict in Iran. Appearing on BBC Newsnight, Lewis emphasized that consumers with major energy suppliers including Octopus Energy, British Gas, E.ON Next, OVO Energy, Scottish Power, and EDF need to take immediate action to switch their tariffs.
The Critical May Deadline
Lewis explained that the real impact on energy bills will become clear at the end of May, not June, when the July price cap announcement is made. "The real political issue on energy bills will come at the end of May not the end of June," he told host Victoria Derbyshire. "That is because at the end of May we get the announcement for the July price cap."
Why This Timing Matters
The money expert detailed how the situation could unfold in two possible scenarios:
- Scenario One: If wholesale energy rates return to normal levels by May, the July price cap increase would be less severe and could be presented as occurring during the lowest energy usage period of the year (April to October), with potential reductions expected in October.
- Scenario Two: If the current crisis persists or worsens by May, this creates what Lewis describes as a "ticking time bomb" where no cheap fixes will be available, the July price cap will increase significantly, and the October to December winter price cap assessment period will likely show continued high prices.
Immediate Action Required
Lewis has been unequivocal in his advice to consumers, stating on social media platform X: "Important: If you can get off the Energy Price Cap right now, you should and urgently!" He explained that wholesale gas rates are spiking due to the Iran conflict, which directly impacts UK electricity prices.
Current Window of Opportunity
The financial expert highlighted that some cheap fixed tariffs remain available, offering rates approximately 14% lower than the current price cap. However, he warned that energy companies are reassessing their pricing daily and many of these deals could disappear imminently. "There's a risk many of the current cheapest fixes will be gone by this time tomorrow," he cautioned.
An additional benefit for those who act quickly: even if consumers lock in a fixed rate now, their bills will decrease by 7% to 9% on typical usage starting April 1st due to government changes in how energy bills are calculated, with some policy costs shifting to general taxation.
Broader Economic Impact
The energy crisis extends beyond individual household bills. The British Chambers of Commerce has warned that inflation throughout 2026 will be higher than previously expected due to Middle East conflict-driven energy price increases. Economists from the influential business group predict slower UK economic growth and continued rising unemployment.
Global markets have already reacted to the crisis, with oil prices soaring above $100 per barrel for the first time since 2022. London's FTSE 100 Index fell nearly 2% shortly after opening as the Middle East conflict created an acute supply crunch.
Who Should Take Action
Lewis clarified that the price cap only applies to standard variable tariffs - the default option for consumers who haven't selected another deal or whose previous fixed tariff has ended. Those on fixed tariffs, electric vehicle tariffs, time-of-use tariffs, or other specialist arrangements are not affected by the price cap.
The exception is prepayment meter customers, for whom most fixed tariffs are unavailable. However, smart prepayment customers can consider the EDF Simply Tracker tariff, which functions similarly to a price cap tariff but with reduced standing charges.
As the situation develops, Lewis emphasized that the duration of the current price spike will determine the severity of the impact on UK consumers. "This is a global economic problem on the back of a huge conflict in the Middle East," he noted, "and none of us know which way that's going to go forward."
