Unfortunately the way the page is rendered doesn't make it possible to rearrange/format differently for mobile/handheld devices.
I suppose the whole site template could be re-written without the existing table-based structure but I'm not sure DUK have the resources among all their other rebranding shenanigans (they got enough flak for that already!)
Did a bit more digging and came across this (looks like what vBulletin are using for their own app)
Maybe a bit expensive though:
https://www.vbulletin.com/mobile/
It's a plugin for vBulletin that allows you to compile an app for Apple and Android to let you browse your forums on the go.
NiVZ