[q]Then it would be [BMC ADO16], but I do not think it is useful to precise it. [/q]

That was my original point, if it's not precised, why does it show up something different?

[q]BMC is not referenced anywhere for all the Austin/Morris of the site, so we cannot use it in searches.[/q]

I realise that, which is why I'm suggesting it. Would it not be useful to search for all GM cars for example?