In message , The Natural Philosopher
writes

Where is the cheapest place to get it?
I see that Amazon has the CG at £14.06 per litre but I hear that
agricultural supplies firms sell it in 5 litre bottles.

agricultural places if you have them.


Any advice appreciated.
Lawrence

This place seems to have an interesting and varied stock, plus a lot of
spec sheets on their stock. Maybe good for research if nothing else?

http://www.progreen.co.uk/index.php
--
Bill