The competition watchdog has launched a new investigation into anti-competitive activity in the estate agency sector – its third since 2015.

Details on the new investigation, announced by the Competition and Markets Authority (CMA) on Friday, are sparse.

It is said to have been sparked by a tip-off that followed a CMA price-fixing probe last year involving estate agents in the Burnham-on-Sea area, which resulted in five businesses being fined more than £370,000.

The CMA confirmed it is investigating a suspected infringement of the Competition Act 1998 (CA98).

A spokesman declined to reveal who was involved in the investigation, but it is thought to involve a number of companies.

He said: “This has been launched on the basis of information that we received following a previous estate agency case we had in the Burnham-on-Sea area so there is momentum being built now.

“This is now the third Competition Act case that we have opened in the estate agency sector since 2015.”

The CMA said it had not yet reached a view as to whether or not there is sufficient evidence to issue a statement of objections to parties under investigation, which would detail what they are suspected of doing and give them a chance to respond.

A decision on whether or not to proceed with or close the investigation is expected by September 2018.

Cases of this nature generally take about a year to progress.

In some cases, businesses being investigated will settle, which generally means the process will take less time and fines will be reduced.

Businesses can be fined up to 10% of their worldwide annual turnover for a breach of competition law, although the CMA will consider how long the infringement took place, the size of the market, and the number of businesses potentially affected.

In 2015, the CMA fined a group of estate agents, three of its members and newspaper publisher Trinity Mirror more than £775,000 between them after a ‘cartel’ ruling.