I worked for Arter Bros at the end of the 1950s, They were AJS, and Matchless, James and Fanny Barnett dealers, among other things. They sponsored Derek Minter on a 7R, and it was in for some work at one time. I had a sneaky ride on it, one evening, when I was working late, absolutely loved it
The G45 was not very well thought of at Arters, don't know why, but the G50 , was . OK
I still have a Trial master waxed cotton suit bought from Arters. Tom gave me 5 bob discount on it at the time and it still cost me a week's wages. Wearing it going home late one night, all my lights went out, on a tricky bend, and I laid the bike down to avoid a metal fence on the outside of the bend. Slid along the road for some distance, and ripped a few holes in the Trialmaster suit. Belstaff repaired it for me free of charge, and it certainly saved me from a few cuts and bruises. I am still using it from time to time, and it was very appropriate with "The Arbuthnot Iron"