Steve
On these locomotives (and every reasonably modern mainline UK loco except those built for the Great Western Railway) the driver (U.S. - 'engineer') is on the left of the footplate and the fireman on the right. As this loco is reversing towards the viewer, the driver is on our left.
At the start of the film clip, we see the fireman look down out of the cab, a routine act as he is checking that the injectors are working. The driver would have had his left hand on the regulator and be looking along the direction of intended travel with his back to the boiler. Because the cab is enclosed at the back we do have a view of the driver in this clip.
This is not likely to be a case of SPAD (signal passed at danger) as the driver would have been directed to move by the signalman.
There is now another interesting video on Youtube of the breakdown train arriving later that afternoon but I haven't yet seen any shots of the lifting itself.
David
The blower seems to be on (this is a jet of steam at the base of the chimney to assist with the draught and so encourage the fire) which suggests that they are not yet at sufficient speed to do without that.
