The Department for Transport told me that there will be 2 trains on Saturday and 2 on Sunday in the new timetable, but I have not seen any draft document showing timings.

I asked First:

4. Peter West at the Department for Transport tells me there will be two trains each way on Saturdays and Sundays. Can you tell me the times that these will run at and what proportion will in fact be rail replacement buses due to engineering?

and have received the following reply:

4. We recognise that there is a significant amount of engineering work required to be undertaken by Network Rail on the routes over which we operate.  We are not in a position to advise as to the impact on specific services that will be replaced by road transport on weekends until much closer to the time of any engineering work.

Yes ... they have only commented on one half of the question and I'm going to re-ask the other part.

To be fair, they HAVE answered three out of four of my questions. I don't like the answers, but never the less they have answered to the best of current ability rather than avoided in all the other cases