Nice spot. I think it is as Nice65 said a Dor or also can be the Minotaur beetle. Most likely a Dor beetle on an open grassland. Both have the excavation and large (up to 10mm) entrance hole.
They drag the dung down into the brood chambers and lay eggs on the dung for the larvae to feed off. The tunnel and chambers can be up to 1/1.5 metres.
I see them in the New Forest on slightly raised edges to the rides.