I've chased in Canada once as well a couple years ago and the signal coverage, even near the border, was extremely poor (just used my roaming data plan and Verizon where I could get it from the US). I also have Mobile Threat Net and for some reason it just froze at the time we entered Canada so it was useless there (guess it's the same problem as when a time zone is crossed I have to change laptop time manually so it updates the radar). I can easily see that with such a fast moving storm and radar being delayed due to poor signal and no Threat Net it'd be very easy to loose control of where the storm is and get hit, especially with a limited road network. I was chasing this storm from the US side, but it was moving extremely fast, couldn't see much from the south so just gave up and tried a few storms developing further south later on, but didn't see anything of great interest that day other than incredible mammatus (for some reason moderate and high risk days have never delivered tornadoes for me). My advice would be to research canadian mobile coverage and make sure data is available as much of the time as possible before heading there, especially if it's a high risk. I wouldn't rely only on the warnings, other than perhaps if I know there is a tornado warning and I have no data, I'd get out of the way fast. Having said that, I've done a fair share of my dangerous approaches including a few "hook slices". The conditions in the hook were similar to those observed in the video, though I haven't seen leaves flying off trees like that. Could have been an embedded EF0, did you have any instruments or feel any cracking in ears etc.?
Anyway, I'm from the UK as well and wish you best of luck and many safe tornado encounters.
Miroslav
P.S. Is the last tour still streaming video?