Hi
Still had no news from Morgan, but that's not really a surprise. The crack is no longer making horrible noises every time I hit a small bump in the road so I guess my plate is working. My only worry is, have I just moved the stress point to the edge of the plate.
I'm not an expert on the way cracks behave or indeed a metallurgist. Any ideas welcome. If a large backing plate is the way to go, I'll fit the other three mounting points with one. I would also get them manufactured locally for sale at cost to anyone else interested.