Months-long major roadworks that were supposed to finish at the end of August - but have now been extended until at least the middle of October - are said to have cost one of Cornwall's best known businesses a 30 per cent loss in trade.

The work at Scorrier to deal with a road collapse caused by mine subsidence is having a major impact on Etherington's Meats - the award-winning butcher's and farm shop - at Wheal Rose.

Cornwall Council says it understands the concerns of residents and businesses in the area but stresses its arm's length highways repair company Cormac is facing "significant challenges" at the site.

The 70-year-old family butcher's, which has been based at the Scorrier site since 1992, employs 80 people. It fears trade, which it says is already a third down since the work started in March, will struggle even more as it enters the quieter autumn and winter months.

Mark Etherington, who took over the running of the business from his father Brian in 2007, said: "The road's been closed off completely since the end of March. It's really damaging our shop and wholesale business - we're out of pocket by between £40,000 and £50,000. It's scary times."

He believes the subsidence has been exacerbated by house building in the area as there has never been a problem before. Since the roadworks began, lorries are having to reverse out of Etherington's car park onto the road.

Mark added: "It's a dangerous manoeuvre, the diversion is dangerous and often blocks the road which is not made for large lorries."

Etherington's Meats near Scorrier, pictured before the roadworks began (Image: Google Street View) An updated notice about the work, which has led to the loss of a bus stop at Lansdowne Park, was issued in May. It stated that, following a series of detailed investigative works, the council had produced a design that enabled the mine feature to be repaired without adversely affecting the structure of neighbouring properties.

Due to the restrictions on site, temporary work was required before installing a reinforced concrete deck. That work was due to start in early June and end two weeks ago.

However, due to the severity of the problem with the old mine works, which caused the road to collapse, it is now due to end on October 20.

A spokesperson for Cornwall Council said: "We understand the concerns of the residents and the business community about the impact of the road closure. We have been sharing regular information to keep everyone updated.

"Unfortunately, we are facing significant challenges at the site, which are causing delays in our work schedule. These challenges include rising water levels in the mine feature and the difficulty of navigating the confined site such as overhead cables and nearby properties.

"It's important to note that this is not a typical highway closure; we are dealing with the remediation of a significant mining feature. Since the discovery of the subsidence and subsequent collapse of the road infrastructure, our teams have been working diligently and safely to address the issues and ensure that the remedial work is completed as soon as possible.

"Regrettably, the diversion route is the only viable option, as there is no suitable alternative route around the site. The concerns around reversing lorries is being reviewed and additional warning signing will be provided where possible."