When I was a driver at Skipton, we signed the whole stations at Leeds, Lancaster and Carlisle....including all shunts at the 'not normally used' ends of those stations. In more than twenty years of driving, I only ever had to do a 'wrong end' shunt twice at Leeds, twice at Lancaster and once at Carlisle.....in each case several years after having first signed the relevant routes. A quick glance at my route maps - which I always carried in my bag - followed by a phone conversation with the signaller, explaining the situation - and we were on our way. Signallers are always sympathetic and helpful to drivers who haven't done a move for a long time. After all, they don't want to have to deal with the consequences of a collision/derailment/ points run-through. However, in the case of a route or shunt manoeuvre that has never been taught or signed, it's a definite no-no.....you have to request the services of a qualified conductor driver or it doesn't happen.
This is indeed the general experience. Very rarely will a little shunt or a platform be outside of the wider route knowledge for that station / area even if it is an unlikely move. And even where the move has not been done in a while, signallers are more than happy to talk through the plan/move and come to a clear understanding.