I know Charlie the bike monger has a demo Pugsley down south in Swanage, think there might only be one or two other demo bikes elsewhere in the UK.
Look loads of fun, it’s just getting to try one out first as they are a bit specialist on the wheels, although nothing to stop you running normal 26″ wheels or skinny 700c/29er tyres. Still lurking in the back of my mind that i should have got a pug over the Karate Monkey, maybe i can blag a go on one at SSUK 😀