On the service where you have to 'continue the van train to Leeds' the train doesn't move despite all brakes being released. However uncoupling 6 of the Box Vans allows the train to only just move, which then leaves you with the issue of having 6 Box Vans left behind.
Are the correct brakes selected on the wall behind the driver? I think it needs to be set to Vacuum - goods for those wagons.
You were spot on I just re-ran scenario and did as you said and I could move the train. Thanks. I think I set it to Air -goods but that obviously did not work.