Why not try a sweet shop, or somewhere that sells underwear? FUs set. (wait for some shhtead...)
I got mine from a model railway shop in Raynes Park, SW19..
Shop v on-line? etc.
Not old stock but new stock now on sale in a shop on a new display stand. A bit early IMHO.
You can buy suitable pigments at the same place - an art or craft shop normally.
The message from "Mary Fisher" contains these words: He obviously doesn't know not to shop in B&Q on a Wednesday...
1/4" is between £10 and £12 http://www.infinitytools.co.uk/shop/3/18/20/index.htm
I bought a great equivalent from the local Pound Shop. Complete with tool for removing old silicone. It all works well.
Try a local Diving Shop!! sounds like one out of a Poseidon Jetstream or Apeks might fit. Where are you based?
http://www.machinemart.co.uk/shop/product/details/pro58-8-pce-metric-t-handle-hex-key-se