Matt,
Thankyou. I've been to the first two sites before, and had no luck, but the brussels bonsai site is new to me. Obviously your searches are more extensive than mine
The key point about the brussels site is that it lists the tree as a 'serissoides', not 'seroides'. Those extra couple of letters make all the difference... lots more search hits
Thanks again, You're a diamond
'geezer' 
Regards,
TB