I can't help but see this as ridiculously overcomplicated, non of that is needed to regularly dispatch a train, wheres the additional danger here, and As long as its not passing a signal it seems pointless to contact a signaler
Are you a driver or operational staff?
All I can say is yes, the procedure is complicated, but, if there was an easier way to do it safely then that would be the standard way. Others have detailed the main reason for this but there are a couple of other reasons that would only apply to certain conditions but mean it's better to have a blanket rule that you call the signaller.
Would your question have been better worded something like "Could someone please explain why this procedure is so complicated instead of just moving up the platform? I don't even understand why the signaller needs to be contacted if you aren't passing a red signal"? You come across very condescending the way I read your post.
I totally get that it needs permission off the signaller to move towards the red signal, a clear understanding between all involved, the guard to do six bells, platform staff to prevent people running towards the train and to mark the position the driver should go to etc. It takes a lot of people and safety critical knowledge. Happily those people were present and capable, so it could happen. Just a shame it didn't happen 20 minutes earlier than it did!!!
The 1527 from KGX to Middlesborough today is a wrong-way-round 5-car Azuma leaving from Platform 5.
I alerted LNER about the potential for resultant wheelchair space inaccessibility (I'm not traveling on it), but impressively a manager at King's Cross noted it and is in touch with control and the signaler to get it rerouted.
Addendum:
Respect to an LNER manager for noticing and getting it rerouted to platform 3.
It shouldn't take the (impressive) initiative of a manager, though. Should be designed out.
Your posts have not only highlighted a serious issue but your replies have shown that you do understand the operational side of the railway and that procedures we have are both for safety and in place for a reason.
I'll say myself though that as someone who's been in an operational position for almost 14 years, I cringed and found it embarrassing that there was either a lack of knowledge or lack of desire to carry out a procedure that isn't exactly rocket science until a manager ended up doing it for the member of staff concerned.
I'll be the first one to admit that I don't know everything, there are many procedures that we learn in training and we joke "you'll never have to do that" or "you'll be having a very bad day if you need to do any of this". I've delayed my train before when asked to do certain things because I've been checking the rule book and my "idiots guide to train driving" that I keep in my bag. If the guard wasn't sure then she should have checked the rulebook or company documents, not just refused.
However excellent news about the set today being spotted. Glad to see something's clearly been taken on board about it. A shame that it took an incident such as yours and a passenger who knew their rights and didn't back down.