A traditional cache placed in the heart of Market Square in Aylesbury.
Be careful as you are likely to encounter muggles, unless you decide to visit at 4am but even then I can't guarantee it'll be muggle free. You are looking for a nano container but don't worry it's not one of those tiny little things, it's slightly bigger, about 4cm long and has a diameter of approximately 1 cm. Bring your tweezers and a pen.
Whenever you visit you are likely to have to deal with muggles from all angles of attack so maximum stealth will be required. Did I mention there may be muggles here? There are even more on a Wednesday, Friday and Saturday as those are market days.
I'm fairly certain this is suitable for wheelchairs but the square is cobbled. If you feel this is not appropriate for wheelchair users then please let me know and I will amend the cache page accordingly.
This is supposed to be a challenge which may need more than one visit so please encrypt any spoilers in your log.
Good luck!