I think this answers your question
http://www.powen.freeserve.co.uk/veg/mushrooms.htm

These two are for the more adventurous
http://www.potseeds.co.uk/mushrooms/growkit.htm

Shitake mushrooms grown on a toilet roll what could be more suitable
http://www.ncbe.reading.ac.uk/NCBE/M...GY/oyster.html
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Ah excellent, thanks!

Dan