Welcome, Colin, both to the forum and to our amazing way of life!
I suppose "rare breed" is a pretty good way of describing Devon. As Aspenshaw says, they're a well-respected outfit who've been around for many years, but on nothing like the scale of Autosleepers, Autotrail, or some of the big Continental builders/converters.
I'm in a similar position, as my Cavarno is pretty "rare" too - I've only ever met other owners when the converters ran an Open Day!
Am I right in remembering that the Monte Carlo is based on the Renault Master van? Like my Ford, that also makes it a rare beast, with the preponderance of Fiats etc for coachbuilts and VWs for panel vans!
We love using our van for days out too, if we can't get away. But at the moment we're pitched up in a pub carpark in Essex, where we'll see the New Year in and stay overnight. If you fancy doing some of that, it's worth joining "Britstops," a nationwide network of places where motorhomers are welcome.