The team behind the £500m Helter Skelter tower in the City is to be accused of breaking a High Court injunction.

Insurance firm Hiscox, which is located next to the Bishopsgate site, is to bring legal action later this month regarding an interim injunction that prevents developer Arab Investments and demolition firm Keltbray from blocking access to Hiscox’s car park.

Hiscox told the High Court before Christmas that 50 complaints had been made about the vibrations caused by the demolition. The judge postponed a ruling on vibration levels until later this month, but granted the interim order.

Now, lawyers acting for Hiscox are to submit photographic and video evidence to support their claim that access to its office was restricted for several days after the hearing.

The new hearing is due on 21 January.

Arab insists work remains on schedule. It is in talks with Z&S to carry out steelwork, and Gartner for the cladding. Multiplex is main contractor.

The 288m tower will be London’s tallest when it is completed in 2011.