At just over an inch long, I’d say what it is, is intimidating! As to species unfortunately no idea.
ETA: It does look similar but not identical to our June bugs.
@gardencat@jacqbb@louannwarren thank you for your suggestions as the the type of beetle, @jacqbb I believe you are correct with (Melolontha melolontha), also known in the UK as May Beetle so very possible very similar to your June Beetle too.
ETA: It does look similar but not identical to our June bugs.