The message
from Gareth Jones contains these words:

As I've got a field now, I fancy trying to sow some normal mushrooms in
it. I'm guessing I need Agaricus campestris, but I can't seem to find
anywhere that sells spawn.

No-one does, AFAIK.

I'm sure years ago as a kid I bought some - they were in an overlarge
whitish paper seed packet (the company did two sizes of packs, small for
normal, large for stuff like peas).
Thinking back, I'd guess the spawn was impregnated into some kind of
grain??

The cultivated variety is believed to have been derived from Agaricus
bisporus, which does not grow in grass as a rule.

Whatever, can't find any, can't remember the company (although I've got
a sneaking suspicion it was T&M in an old style pack - 30 years ago!!)

Can anyone help??

All you can do is to find a clone of field mushroom, horse mushroom, A.
macrosporus etc, dig a patch of turf from the outside of the ring and
transplant it.

However, there are many other variables to take into consideration: the
pH is crucial, as are available nutriants. My advice would be to let the
field to someone with a stallion - they are reputed to be more
attractive than mares to mushrooms.

--
Rusty Hinge
horrid·squeak&zetnet·co·uk
http://www.users.zetnet.co.uk/hi-fi/tqt.htm