I am going on Kew's "
Botany for Beginners" week long course next week - along with
a friend from work who also managed to get a cancellation - and have spent this afternoon
walking around London trying to find these. Should have just come straight here first ;-)
Eventually after a long story which I shan't bore you with involving umpteen shops, baffled
shop assistants and even the study information centre people at UCL (very helpful, let
me have a go on Google) I found my quarry at Holts on Hatton Garden. I now have two
10x folding hand lenses for a tenner each, one for me, one for my friend. They come in
a little leather outer case and are quite 'old school' looking.
I was glad I'd read this page at UCL before venturing off to Hatton G. (via every camera
shop, opticians and watch repairer en route to ask them... just in case!) as otherwise
I might have assumed that 20x was automatically better than 10x or thought I could get
away with a regular magnifying glass (usually about 3-5x):
http://www.kooters.com/sezlens.html
We also have new notebooks for the course too
(Hatton Garden is near Chancery Lane / Grays Inn Road and is basically a road of
jewellers and jewellery suppliers, and not much else, in London).
Holts website:
http://www.rholt.co.uk/holts
(not affiliated, just delighted to find somewhere in London that sold these lenses but I
expect any of the shops along that road will have them too).