Today, I dropped into a local hobby shop to see if they has the big Corby and they has stock of both sizes.
For anyone looking for them, the website is www.coltaylormodels.com

I was lucky enough for "the boss" to give me an instant budet for the big version. I now have "big pland and little plane"
Now, all I have got to do is pick a nice gas engine for the plane, hopefully something in the 40cc range.