Update from Brian Phillips who worked at Roberts Cycles.
I initially sent Brian a photograph of the frame and Brian has stated -
From the image there, i can see the tubing used is the original Columbus Max with non-max Columbus or Reynolds fork Blades. The bottom bracket shell is a cast steel unit made to accept only Maxed tubing. Fillet brazed/Bronze welded construction.
Brian is also going to see if he holds any further information.
Update from Brian Phillips who worked at Roberts Cycles.
I initially sent Brian a photograph of the frame and Brian has stated -
From the image there, i can see the tubing used is the original Columbus Max with non-max Columbus or Reynolds fork Blades. The bottom bracket shell is a cast steel unit made to accept only Maxed tubing. Fillet brazed/Bronze welded construction.
Brian is also going to see if he holds any further information.