The wood is Poplar, but only because it was what we were using on the course.
The tools of the trade are nice and cheap too, the main carving was done with a Mora 120, or Mora 106, both £12 and the spoon bowl was done with a long handled Ben Orford spoon knife, which Barn sells for £29, about £30 cheaper than retail.
I'd absolutely recommend it, the centre where it's done is just down the road in Mile End from where I met Phil when he was doing his stick fighting course. You could bike there and leave the bikes in the centre. The course cost me £50 and included a basic, but very tasty, veggie lunch.