Thinking about it, I am pretty sure the Merlin MCB's have a metal flat bit behind the vice terminal, this rising up and down with the terminal, preventing the busbar going behind.
I thought that was the case too Lec, but I couldn't find a pic to prove it and too lazy to go and root round in the back of the van
Do you remember the earlier Merlin boards before the sliders... where you had to attach a forked bit of metal to the busbar and fit the breaker to that? Came across one the other day, and noticed a load of breakers were not sitting quite in line... on further inspection it seemed that someone had added few circuits and forgotten to obtain the 'forks' and bodged something with ring crimp
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