I had never known where any were before and in previous google searches I had thought they were all online and buying Hydroton online costs about double in postage what it costs for the actual pellets. I had asked my usualy media supplier and he said that while he stocked it he did not like to send it mail order (only selling it at shows) because of the postage.
Anyway, I did another search looking for a screen shot of the Hydroleca that Hedge had suggested (having remembered seeing one somewhere) so I can show a picture of the bag at my local garden centers and see if they stocked it. The first site didn't have that make they had just clear unbranded bags of Hydroton, but as I was about to close it I noticed a news item about them closing their Solihull branch... and I thought "what a shame" because that's not so far away... not brilliant but we go that direction ocasionally. As I read further I realised that they were advising customers of that store to go to one of two others branches... one of which is REALLY close
Anyway, thanks for the offer of the Deli pots, but I've already made quite a big collection of pop bottles of various sizes. I'm quite partial to drinking fruit squash concentrate with lemonde rather than water so I've had quite a few recently.