Having chatted to some people in the know, there apparently was a steam tour on the S&C yesterday to mark the anniversary of the fifteen guinea special. Can't remember any details though.
I was in the area on Sat. 11th, with friends who were seeking to follow in so far as possible, and photograph, the three steam-hauled specials which ran in North-West England on that day. Steam specials on the main line are not my personal "bag" -- I was along as a "friendship" thing, and because I like that part of the country: I may thus be a bit vague and / or not totally accurate re the details; plus, have the impression from my friends that at least in a large measure, these specials would likely have been running anyway -- their being exactly fifty years after the "Fifteen-Guinea" job, largely coincidental.
At all events: the three specials -- with steam, I understand, only on the northerly parts of their respective runs - were:
Originating at and returning to Bristol: steam power A4 Union of South Africa, northbound over Shap, to Carlisle area; return via Settle & Carlisle line, then via Clitheroe and on southwards.
"Cumbrian Mountain" -- originating at and returning to London (Euston, I think): steam power Jubilee Galatea, northbound over Shap, to Carlisle area; return via Settle & Carlisle line, then via Clitheroe and on southwards.
"Waverley" -- originating at and returning to Leeds: steam power Jubilee Leander, to Carlisle area; over Settle & Carlisle line, both directions.
In each case, the train included throughout the parts of the journey with steam; a diesel loco (different types on different trains) coupled immediately behind the steam loco -- at the insistence, I gather, of Network Rail. Will just say: not to my taste -- but I'm not a devotee of this whole scene anyway. My friends, enthusiastic photographers, were disappointed at the diesel element in so far as the diesel locos seemed to be doing most of the work (with enforced diesel participation thus, largely because of perceived fire risk -- so, "diesel doing most of the stuff" was "a feature, not a bug"): consequence being, little in the way of photogenic smoke / steam from the steamers. However; there was steam working of a kind, over some of the route of the "train with the monstrous fare" fifty-years-to-the-day earlier.