Thanks to everyone for their tolerance & information. I think there's a consensus that:
A lot of pop groups use other acoustics, often handmades, but as they don't have prominent logos I don't notice them
A lot of folkies use Gibsons but for some reason they don't enthuse about them as much as the Martin boys and girls.
Seems like a theme for a song (tune: Martin and Coys) The Martins and the Gibsons!
I consider myself suitably better educated for your responses. (That's what I'm here for, to steal knowledge from you and leave some tired old jokes as poor exchange!)
RtS
:o)