Chris wrote: "Thanks for the update. How are other people making progress
with producing
protocols?"

No progress here, sorry. I have too much on just now, including having to
trail all the way down to Hampshire to give a lecture on GM. As my stocks
fell from 8 to 6 over winter I won't be venturing any to invasive
experimentation. I got involved in this interesting project when I had a
lot more spare time, but it always seems to happen that May-June become
hectic.

David Heaf
N Wales, UK