I highly recommend the Tring Summit level section of the Grand Union for some straight-forward paddling. It's beautiful any time of the year, access is easy, you are covered with a BCU licence, it's very sheltered and there is a long stretch without locks. I used to live in Aston Clinton before migrating to the northern wilderness and it was our favourite local paddle - in a Birch Creek boat by the way, the same mould as a Mega.
PWC
PWC
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Know less, carry more - you're in a canoe !