I couldn't find a recipe for Octonaut-style fish biscuits online so I made one up, and I'm pretty pleased with it (although DH can't get past the idea of them being biscuits with fish in). I made some again today, and used them as cobbler-style dumplings instead of potato on fish pie, just added them on afterwards.
5oz flour (I used self-raising but plain may work better)
2oz butter or margarine
1 egg
1/2 can tuna flakes in brine
Tabasco sauce
A little milk
Rub in butter and flour.
Beat egg and stir into mixture.
Drain tuna flakes well, press out as much moisture as possible, then stir tuna flakes into mixture.
Add extra flour if mixture is too sticky, until it becomes a dough-like texture.
Add a few splashes of Tabasco sauce and mix well.
Roll out onto a floured board.
Cut into fish shapes (or, for perfectionists, make a fish template out of greaseproof paper and use that to cut around).
Place on greased baking tray and brush with a little milk.
Cook Gas Mark 6-7, or around 220C (in our fan assisted electric oven) for about 8-10 minutes or until golden.
(If you want to see what the finished product looks like, there's a picture on my blog: bit.ly/qYM1hF)
It's the first recipe I've made up that's not been a disaster! :)