A temporary desalination plant will have to be installed to provide enough water during the construction of Sizewell C if the £20billion nuclear power plant gets the go-ahead.

Consultation is under way on the plans for the unit, which would take sea water and remove the salt to create drinking quality water, because water companies cannot guarantee supplies.

But opponents of the power project say until the desalination plant is ready it will mean 40 more trucks a day visiting the site to deliver potable water.