Vets report said Avian Leukosis rather than Mareks. Not good news but I think better than Mareks. Plus the PM samples showed all sorts of other things - worms, coccidiosis, other parasites. Apparently they are more susceptible when they have Leukosis but nevertheless we obviously have all those things present which is scary given that we've only had the chickens there since September (with no poultry kept on the land for 70 years before that!), it's a big run and they were (before the winter) free ranging quite a bit.
I have to have a closed flock for 6 months and no hatching (chicks more susceptible) and if the rest are still all OK after that, I can think about getting a replacement cockerel. But at least no culling. Keep your fingers crossed for the rest of them

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Good news is that the ducks and geese will be unaffected so I can still use the hens as broodies for them...
H