So I posted a while ago for advice on fitting a new shower to my
existing plastic pipework - the advice was that I need to use inserts
from the same manufacturer as the pipe. Since then I've exposed the
pipework a bit, but am not clear what manufacturer it is. Can anyone
advise?

Here's the existing setup:
http://img842.imageshack.us/img842/945/img8202n.jpg
From a bit of googling, does that look like a JG/speedfit connector?

Anyway, the length of pipe that I can see has the following lettering
printed on it:
POLSKA INSTAL AT/98-01-047

That obviously implies a Poland link... all Google throws up are the
following:
http://www.diynot.com/forums/viewtopic.php?p=672811 (5th post down),
where some bloke also has piping with this on; but no other info
and:
http://www.pbpsa.com/eng/downloads/pbpsa-brochure.pdf (see Figure 4)
which seems to suggest POLSKA INSTAL is a Polish standards agency.

Hmm. What the hell is this stuff?

I'm a plastic-plumbing-newbie, and anxious not to give myself problems
by using the wrong inserts - is there any mileage in trying to
cannibalise the old fittings and reusing the old inserts? Or is that
like recycling old olives...?

Thanks
David