Question to the Department for Transport:

To ask the Secretary of State for Transport, how much he estimates will have to be spent protecting the High Speed 2 track on phase 1 and phase 2 against the effects of mining subsidence; and whether that sum is included in the overall projected cost.

On Phase One there are no specific allowances relating to mining subsidence in the cost estimate as there is no active mining below the route, nor any recorded abandoned mining shown in the publically available records that have been researched. Physical ground investigations and desktop studies of existing of records will be undertaken prior to construction of the railway, and allowances have been made in both the cost estimate and the project contingency for any ground treatments that are identified.

On Phase Two there is an allowance within the cost estimate for the risks around crossing open cast quarries, mines and landfill sites and the current level of design reflects where appropriate the difficulty of crossing these type of areas.