Synjeco has had this up on their website for a few years now Ally, along with the St. James plug, which was added a bit later. It works out to about $12.50 per 50g when you buy at least 500g, and that includes the shipping to the US, so still fairly reasonable actually.
I've been fortunate enough to have tried some of each, and even though I love the plug presentation and all it offers I didn't find the smoke to be a sufficient improvement on the flake versions to warrent the extra expense personally (FVF and St. James flake can still be had for about $50 per pound in bulk form here in the US, when it's available of course).
I'de say £11.15 is a competative enough price, comparatively speaking. Probably well worth a flutter.