On Fri, 19 Dec 2014 23:44:42 +0000 (GMT), Dave Liquorice wrote:

Finding a suitable chamber is looking to be the hard bit. All the
plastic food storeage containers I've looked at so far are milky not
clear.

TK Marx may have come up trumps with a "Secret de Gourmet Boite de
Conservation Hermetique 0.4l" £2.99. Google/TK Marx site (nasty
horrible javascript only thing) seems remarkably reluctant to produce
an image or anything that looks similar. It's clear, round, flat
bottomed(*) with a lid that seals with a lever action.

(*) Apart from some slightly raised markings for recyling (7 SAN,
styrene acrylonitrile) and food safe logos etc. They won't last long
under the influence of fine sand paper and block...

--
Cheers
Dave.