The estimated cost of a new surgery centre to tackle Scotland’s NHS waiting list backlog has more than doubled.

The National Treatment Centre (NTC) in Livingston was originally projected to cost £70.9m but estimates now suggest the new facility will cost £184m.

A new specialist eye hospital for the Lothians has also jumped in estimated cost from £112.5m to £123m.

NHS Lothian said the costs are “forecasts only” and subject to a number of factors.

The two centres are part of a network of 10 sites across Scotland which are meant to be delivering at least 40,000 additional elective surgeries, diagnostics and other procedures per year by 2026.

The Scottish government has said the network is the “single biggest increase in planned care capacity ever created in the NHS” but the £400m plan has been subject to a series of delays with many NTCs years behind schedule.