Jackson Civil Engineering are taken off scheme by Tesco as result of last summer's tunnel collapse on the site.
Supermarket giant Tesco has drafted in contractor Costain to conduct a review into the future of its troubled Gerrards Cross project after kicking contractor Jackson Civil Engineering off of the scheme.
The move follows last June's tunnel collapse at the site, where Jackson was the main contractor. A 30m section collapsed during backfilling over the tunnel, throwing rail services into chaos for two months.
Costain was originally due to build a Tesco store on top of the 300m tunnel over the Chiltern Railway line at Gerrards Cross. It will now perform a three-month assessment to enable Tesco to make a decision on the future of the £25m scheme.
Costain said in a statement: "Tesco has appointed the new team, comprising Costain and a small number of new subcontractors, to review the Gerrards Cross project before taking a final decision on its future.
"Costain engineers will be undertaking surveying, inspection and ancillary work within the site boundary in the near future."
Costain added: "The review will allow Costain to fully understand the details of the project to be able to implement the design in a way that restores public confidence in the safety of the project."