Oof, nothing makes your heart stop like turning into the village in the van and seeing 406 come belting down the hill on her own, no other sheep in sight, BAAAAing loudly. Sped home, grabbed some sheep food, jumped on the quad and went back down there. She's not particularly tame and is quite wary about following me even when Nibbles is with her, but she followed back up the hill a little way and then went on strike. So I went on because I could see some sheep on the ridge and thought it might be the rest of mine, although if it was they'd come a long way down from where I put them out. Shouting and rattling the bucket only produced one answering BAAAA and Nibbles came trotting out of the flock (turned out to be a neighbour's ewes), which was a huge relief, because my first thought when I saw 406 on her own was that Nibbles had died.
Nibbles and I, followed at a distance by the neighbour's flock, walked back down to where I'd left 406 and there was much happy BAAing as they were reunited. Those ewes only got put out today, so I'm guessing somehow my two got mixed up with them and 406 got separated and confused. Went down to the other end of the grazings where the other 20 were still happily working their way through the remnants of the bales that got put out for the cattle before they went off to winter indoors, so all's well that ends well.
And I have toffee cake from the local bakery