@pamartia You're 100% correct! I was wrong. Apologies to @1981Miked and anyone else who followed by incorrect advice and ended up with the wrong size clamp ?
No worries mate, never ordered one in the end anyway. I’m having a sabbatical for a couple of months with the cold wet weather. Last time I was out it was -2 and the battery did now like it at all. Plus my left elbow has been playing up for over a year (golfers elbow apparently), doctor said a rest would do it good so let’s see what happens.
@1981Miked All good then, at least you now know for certain what size to get if you do order one lol. Hopefully your elbow gets better , the weather improves, and you can get back out on the bike soon!