This was to prove foolish.
The Rochdale canal IS notorious for being shallow but we'd never expected it to be THIS bad...dragging our bum along the bottom - hitting goodness knows what as we went and MORE often than not getting completely stuck for hours at a time.
We came along a chap who'd got stuck a couple of days previously who'd given in and was just waiting for rain... right on a winding hole but to be honest it didn't matter as there was so little water in it, we'd not have been able to turn anyway. It turns out, 'Ellis' sit's a couple of inches deeper in the water than 'Memory Maker' - ergo, US going up ahead (and getting stuck) wasn't helpful.
Between locks 7 and 8 we got properly stuck in a thin section... the resultant call to CRT (and a couple of Tweets later), the water level increased enough to get moving again.