Thanks for an interesting update on Hemsby coastal erosion. It's fascinating to see the effects of the force of nature but I'm saddened for the home owners affected by it.
There was back in the 80's a small maybe ROC bunker in a field down from Great Yarmouth we "discovered" when I was a teenager, there was a significant amount of field between it and the cliff edge but not sea defences that I can remember, this was 30 years ago, do you know/think thats likely gone now ? Sorry I cant give you more precise location details, we only went the once and were guided by locals.