A moment or two after I completed the above the situation appears to have been resolved and the 1149 has continued on its way, 108L. The EM (1151 ex-Liverpool) departed Stockport at 1423 (88L), the 1253 Airport - Cleethorpes has departed Piccadilly also at 1423 (65L), the next Cleethorpes has gone only three minutes later, at 1426 (8L), the 1251 Liverpool - Norwich has left Oxford Road at 1428 (49L), and the 1351 Liverpool - Norwich has left Lime Street at 1424 (33L). The 1349 ex-Picc stopper arrived Chinley at its scheduled time of 1423, i.e. just after the line had been cleared at Edale, and it has continued towards Sheffield unimpeded. I don't know what happened to the 1153 Airport - Cleethorpes, it seems to have fallen completely off the tracking.