I would love to leg through the Dudley Tunnel if Shadow is deemed to have a low enough air draught. Nicholson suggests that all one has to do is give 24 hours' notice, "if possible", and there could even be an electric tug for escort. We would need extra crew for this, and, presumably, legging boards. My brother and I legged for fun through the short Woodley Tunnel on the Peak Forest Canal in 2005 (photo above) but did it by lying on the cabin top and "walking" along the roof of the tunnel. I can think of two reasons for legging to be done sideways, as it were: you're not constantly dislodging bits of soot and masonry into your eyes; and the width of a tunnel is probably more constant than its height.
Has anyone reading this legged through Dudley Tunnel? I'd like to hear from you if you have.
David, are you available in April? I'll let you know when I've worked out which day it's likely to be.
edited to correct spelling of Wyrley