Sawfly larvae on Pine

Sawfly larvae on Pine

Observation - Sawfly larvae on Pine - UK and Ireland. Description: I think that these are Sawfly larvae, and they seem to bear a resemblance to pics of Diprion pini. I have no idea of other possibilities, though. 2-3 cm long. Any ideas?

I think that these are Sawfly larvae, and they seem to bear a resemblance to pics of Diprion pini. I have no idea of other possibilities, though. 2-3 cm long.

Any ideas?