I took my 5m grp boat with 15hp on the Kennet & Avon a few years ago- great fun being the 2nd fastest boat on the canal (Environment Agency boat won with 2 x 60hp)
Once darkness fell we opened up and scooted along at 12 knots
It was scary being in a lock with 20 tons of barge next to you
We based ourselves in Bath as it had a slip way and campsite
I'm thinking about getting on the Monmouthshire canal with the RIB.....