Contractor on Gerrards Cross job will include £2.2m provision in accounts due to be announced this week.

Jackson Civil Engineering is set to reveal a £2.2m hit over the Gerrards Cross Tesco tunnel collapse.

The Suffolk firm, which was the main contractor for Tesco on the job, has included the provision in accounts due to be published this week.

Jackson was building a 320 m covering tunnel over a railway track last summer when a 30 m-long section collapsed onto the lines. The tunnel was to create a base for a £20m Tesco supermarket.

Tesco drafted in Costain to conduct a three-month review of the project in March. Jackson is no longer working on the project.

The Health and Safety Executive is still investigating the collapse, which is believed to have been caused by overloading of the crown of the threepin tunnel.

Turnover for the Suffolk contractor is expected to reach close to £100m for 2005.