I've changed my mind again . . it IS Castlerigg. You can see the 'circle in a circle' just above the two blokes, to the right. I've looked at me sketches from my visit last month.
Yes, it is.
Final answer.
I think.
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My first impression was that it must be Castlerigg, but for some reason it didn't seem to be quite right. The mountainside looks too close on the sides and too distant in the centre. Oh well, after confirmation I'll say it again: 'it must be Castlerigg'.