A controversial new Scottish airport has been closed to emergency flights at night, The Herald can reveal.

Officials at the multi-million-pound new-look airstrip in Oban have told air ambulance, search and rescue, and other lifeline services they can no longer land after 5pm.

They did so amid a growing and increasingly bitter dispute between Argyll and Bute Council, which owns the airport, and TLC, the firm that used to run it on the council's behalf. Its owner, Paul Keegan, has been an outspoken critic of the council and its much-derided proposals to turn Oban into a major air hub for Hebrides.

The airport, and sister strips on the islands of Coll and Colonsay, has still to secure a licence that would allow it to operate subsidised passenger flights that were supposed to have started earlier this year. The council has now spent more than £8.5m on rebuilding and running the three airports, far more than proposed.

Last week, Mr Keegan was told by the Civil Aviation Authority (CAA) he was no longer entitled to use council-owned radio frequencies to guide aircraft, including emergency helicopters, into Oban for refuelling.

He had been doing so, without a problem, for the best part of 10 years. The council withdrew permission for him to use the frequencies. Mr Keegan said he only found this out from the CAA.

Mr Keegan said: "I had no choice but to stop."

However, an Argyll and Bute Council spokeswoman said: "The reason why the airport has been used in the past for out-of-hours services was for TLC to provide fuel to aircraft. The appropriate way for this to be managed is for TLC to apply to the CAA for a business radio frequency to operate air-ground services."

The council appears unwilling to provide the service instead of Mr Keegan and TLC. The spokeswoman said: "This matter of providing fuel to the emergency services during out of hours has never been a council function and for TLC to continue providing this service, they should take appropriate steps to acquire a business licence."