Our dowels arrived this morning!
Had a bit of a shock cos as we have a huge log pile growing it's own toxic mushrooms we thought we'd set a few to one side and grow something edible aswell, but it looks like we have to go hunting for specific logs instead!!
They recommend oak, beech or birch which must be complete logs (not split) and no more than 6 weeks old with a diameter of 4-6 ins so it doesn't dry out too quickly (larger diameters take too long to impegnate). So not too fussy then

Maple,aspen,ash,alder,willow and poplar can also be used. Could this be the reason people haven't had much sucess with them (aswell as keeping them damp,shaded and warm!!)?
A very helpful leaflet came with them - 2 pages of A4 - so I hope to get it right. They came from
ann@annforfungi.co.uk if you are interested.