Choice of river was the key to success I think and while I also fish the Severn, Teme, and Avon etc, I stuck it out on the Dove and Trent instead this year and found it tough going. As it turns out I would have possibly done better had I fished some of those other venues, but you live and learn as they say!
The ice must be at least an inch thick
From the photo's I've included from a walk along the canal yesterday you can see why it's not been an option, certainly for any lure fishing.
There was someone having a go yesterday, with a pike float just a rods length out through a 1m2 hole made in the ice. I wondered how he would land one if it took off under the ice and went up the canal ... just asking to be snapped off surely?