For some reason Blogger isn't letting me comment on my own blog, so in orr not to keep Halfie and Alan in suspense any longer, the last (and arguably least famous) of Rolt's seven wonders of the waterways is the Burnley Embankment on the Leeds-Liverpool. Which I haven't seen either.
The one out of the seven which I have visited - and indeed traversed - is the Standedge Tunnel.
BCN Challenge bulletin #1
2 days ago