CAIRN Energy has shown its faith in the potential of the North Sea although the latest drilling off Senegal has underlined the appeal of other areas.

Edinburgh based Cairn said best estimates of the size of a find it made off the West African country have increased to 563 million barrels oil equivalent from 473mboe following successful appraisal drilling this year.

Chief executive Simon Thomson said the company had made significant progress in the first half with its plans to bring the SNE find into production.

He also emphasised Cairn expects to achieve attractive returns on the hefty investment it has made in the North Sea in spite of the challenges posed by the crude price plunge.

Cairn started production from the giant Kraken field off Shetland in June with Enquest. It expects to bring the Catcher field onstream off Aberdeen with Premier Oil later this year.

“It’s worth noting both these projects are coming in 25 per cent under budget and they are extremely attractive economically,” Mr Thomson told journalists.

Cairn expects to produce 25,000 barrels oil equivalent daily from the fields next year, at an operating cost of just $17 per barrel. Brent crude fetched around $52 per barrel yesterday.

Mr Thomson said Cairn is screening potential acquisition opportunities in the North Sea.

It faces significant competition for quality assets in the North Sea, although some firms have been trying to reduce their exposure to what is seen as a high cost area following the fall in crude prices since 2014.

The company expects to drill up to 10 wells off the UK and Norway by the end of 2019, targeting over one billion barrels resources.

It has added exploration acreage off Mexico and Ireland in recent months.

Kraken gave Cairn the first production the company has had since selling a controlling stake in its former Indian subsidiary to Vedanta in 2011.

It could use cash generated from Kraken and Catcher to fund work on other assets.

Cairn hopes an arbitration panel will resolve its long running tax dispute with the Indian government early next year.

The company is seeking $1bn (£0.8bn) damages from the Indian government, which has prevented it from selling its remaining holding in the Indian business. It insists it has paid all taxes due.

The government seized $105m dividends due to Cairn in India in the first half.

It is seeking $1.6bn from Cairn. The retrospective tax claim concerns events leading up to the 2007 flotation of Cairn India. This held the giant fields Cairn discovered in India under founder Sir Bill Gammell.

Cairn earned $11m revenue in the first half covering royalties due from Petrochina on producing fields in Mongolia. It demonstrated its right to the royalties following successful international arbitration proceedings.

The company did not book any revenue in respect of Kraken in the first half.

It lost $28 million after administrative costs in the period, against $53m last time.