Struggling Thames Water has said a new reservoir in Oxfordshire could cost more than three times the original budget, pushing the eventual cost to be covered by bill-payers to as much as £7.5bn.
In a blow to government plans for an expansion in the number of reservoirs across south-east England, the heavily indebted utility said a review of the Abingdon project had sent the estimated cost of construction from £2.2bn to between £5.5bn and £7.5bn.
