Here, an expensive 3Kg drum of costs ?2.00, but most make their own. (Sensas, etc, not be readily available)
Having spent most of the year fishing the method, and having had some excellent results, I have come to the conclusion that other than a nutritious bread crumb base, the key factor is the consistency, that should vary with the local conditions on the day. The second factor being the accuracy and frequency of re-casting; the third - don't 'strike, and don't pick the rod up too early!