Just an update to save anyone else the hassle.
Had a quick nose around to see if it was accessible after many years away.
Topside all looks ok.
Vent shaft still present but entrance hatch has a big shiny silver padlock.
I suspect due to it's proximity to a Naseby battle viewpoint it's kept on top of.
Bonus, if you hang around it long enough a strange bearded type will come and stare at you from the other end of the field until you leave.
Had a quick nose around to see if it was accessible after many years away.
Topside all looks ok.
Vent shaft still present but entrance hatch has a big shiny silver padlock.
I suspect due to it's proximity to a Naseby battle viewpoint it's kept on top of.
Bonus, if you hang around it long enough a strange bearded type will come and stare at you from the other end of the field until you leave.