I bought a Trumpers one, very pricey but I was ordering something else at the time so convinced myself it was a steal at £13.50. In use is by far the best, it is like Osma but even smoother, also it is a big 110 gram block which is bigger then the matchbox Osma ones and therefore is easier to handle when wet and so far it seems less likely to slip out of your hands in use. It comes in a handy plastic container so that sorts the storage problem of wet cardboard, I just put it back in the box and leave the lid off for half an hour to dry off. When it goes done/shatters I will get a cheaper one and re-use the container.
Having said that I bet I drop mine tomorrow
still at least I will hopefully have bigger shards and can shave one down to an Osma size block.
Think the red label ones were "Hero", blocks, I got half a dozen from Spices of India for the guys over in NI and I used one till I played hockey with it and bought the Trumpers one. I just checked and they have went up from 55p to 60p and it is a different brand now.
Ollie, if I had a spare I would send it but....
Just had a thought, I am passing a couple of Indian supply stores next Saturday and will have time to kill when I pick the missus up, if anyone wants one I will grab a few and post them on at cost. I will phone them tomorrow and check they have stock and if so will post a group buy in the relevant section and update this post.