Thanks to @Nachojammers, my good friend of manchester and sussex uni days, I have been pointed at the
Moleskine site, which is ace. And it turns out my dream format (Quadrille, psuedo A5 portrait) does in fact exist, in spite of me never having found it in
Foyles or
Pen to Paper(where I always seem to go Moleskine hunting).

Yay! Whoot etc.