Found a helmet by the wall at Knotlow tonight.
Let me know the colour & make along with what head torch is fitted if it's yours.
I live near Castleton so happy to meet up next time you're up here caving ;-)
Was there on Sunday and it should be a red helmet with Fenix lamp and slim black side torch.
Thanks Smudge, I'm due in Castleton on the weekend so could grab it then if you're around?