This is a good point, and one which we should all remember, including sceptics of the strikes like me. It's easy to rationalise that, on one level, if a lack of guard cancels a train, a disabled person would not have been able to board it anyway, whereas with the OBS model at least the train can continue in normal service and reduce congestion. But I entirely appreciate that the uncertainty must be a real source of stress, anxiety and frustration, to the extent that it might reduce disabled travellers' confidence to take a job in London. Similar uncertainty has, after all, been the major cause of stress, anxiety and frustration in all commuters on the GTR network during the travails there and it would clearly be wrong to wish that on disabled travellers on a permanent basis. I think my only qualification to the above is that we should be happy to investigate all methods of dealing with the issue, including technological changes (automatic ramps, etc) and greater use of station staff.