Question to the Department for Transport:

To ask the Secretary of State for Transport, what information his Department holds on the amount of time it takes to despatch a train under (a) driver and (b) guard conductor dispatch.

No simple answer can be provided to this question, as the time taken under either mode is dependent on too many variables, including class of train (there are over 60 classes of rolling stock in use on the UK rail network) and station operating conditions.