Found a hen I thought missing, sitting on a massive clutch of eggs in the hedge. She had 12 eggs and clearly couldn't manage them all. So I moved her indoors under cloak of darkness a few nights ago, and gave half her clutch to a fellow broody.
They managed to squash one (don't think it was fertile anyway) so are now sitting on 11 between them.
Who wants a sweepstake (for fun) on how many are fertile? Judging by how long the hen was missing, they could be getting quite near to hatching.