I understand that the Gollie has a flow, so less likely to freeze. I just wasn't sure what the general temperature to freezing was on other canals (and don't quote the freezing point of water). Was hoping water/canal craft movement, and water impurities might lower the general freezing point. I wouldn't want to travel through anything other than a millimetre or two of ice as it does seem likely damage can be incurred upon more than just my own craft, but others and potentially wildlife. I'll stay this side of Hurlesdon until Sunday when the milder weather arrives, hopefully. Then crank it to Chester