[UK-CONTEST] Off topic - airmail envelopes

[Danny Higgins]

I thought I would have a go at clearing my backlog of direct QSLs before the
postal rate hike at the end of the month, but I only have one airmail
envelope left.  It measure 96 x 144mm and is ideal for QSLs, but I can't
find a replacement size anywhere.  Most of those offered are 90 x 187mm,
which is not quite tall enough for many cards.  This one is marked "WH Smith
Quality Bond AIR MAIL", but it is many years old and no longer appears on
their website.  Has anyone found a suitable size of airmail envelope for
QSLs?

73

Danny, G3XVR