A 300-tonne lorry caused traffic chaos at the weekend.

The 75-metre long vehicle, carrying a transformer from global energy giant GE, was escorted by police on the M25, M40 and through Iver Heath on Sunday.

Police said it would travel on the M25 and then on the M40 towards Slough and Uxbridge, travelling at 10 to 15 miles-per-hour and that some rolling road closures would be needed to get it through.

They confirmed the transformer was going to a substation in Iver and it needed to be escorted during the day to go over kerbs, islands and other raised parts of the road, adding that no damage was done and Bucks County Council had replaced the street ‘furniture’.

GE spokesman David Morris said: “GE has recently delivered a 400/275kV, 1100MVA, three phase auto-transformer to National Grid, Iver substation, for its SGT5A refurbishment project.

“The transformer is fully designed and manufactured by GE in their factory based at Stafford.

“The transformer will be installed, oil filled and commissioned by GE and will be connected to the National Grid Electricity network to help strengthen the infrastructure of the country's electrical supply network.”