Passengers at London Heathrow and Gatwick have been alerted about the possibility of "major disruption" at the airports, which could impact vacationers and visitors. According to press reports, a portion of the M25 will be closed in both directions starting this Friday and will occur several times during the next few months. his could cause major disruption to those heading to and from Heathrow and Gatwick airports. Lifestyle expert, Matthew Harwood, at Confused.com travel insurance, comments: “Road works affecting the M25 could have major disruptions to those flying in and out of London's busiest airports next week. So those who need to travel to Gatwick and Heathrow are urged to plan ahead. "As motorists are being encouraged to consider alternative routes during this time, this could mean that these also become heavily congested as a result. So finding other means of transport, such as train services which go direct into the airport terminal, could be the best option. "But travellers should still allow themselves plenty of time to get to airports, as it's likely that the whole transport network will face major delays. As the disruptions aren't anything to do with airlines or airports themselves, it's unlikely that compensation will be offered to those who miss their flights. "So in this instance, giving yourself extra time could mean you don't start your trip off on the wrong foot." Jonathan Wade, National Highways project lead, has urged Britons to only use the M25 if their journey is “absolutely necessary”. Replying to the warning online, a Brit wrote: "It seems that non British tourists travelling to those airports don't have to suffer the same delays as the British. We have become second class citizens IN OUR COUNTRY. You couldn't make it up." The M25 is due to close between junctions 10 and 11 from 9pm on Friday, March 15 until 6am on Monday, March 18.