No, have not contacted them so far. They are not answering the phone at any time.
You are right in assuming the arm may have to be replaced again unless I can find a work around. I have a spare ABS sensor (£50+) that I may whittle down until it is in the correct position especially as it looks like I'm stuck with this arm.
It will probably be better to get a new arm from elsewhere ot try fitting the bearing kit.
The backplate screws had to be drilled off as they were ceased and it took just under two hours with all the garage kit (lift, air tools, etc.) at hand, possibly take longer without it.