Suggest you find out who is using it and who is phoning up aircraft owners using G info data then.
If you are barely using it 2 days out of 7, NOTAM is the only sensible option.
And how old is that risk assement? If its more than 8 years old it was when one of the jump pilots was rumoured to be shagging one of the ATCO's at Dundee. And if you having airpox's with CAT on the instrument approaches it needs looked at again.