I thought I would wait a while........ I asked the fine gent in Shannon why 10 before. He said that sometimes aeroplanes didn't make the restriction and he prefered to hand traffic to MAN level. The remark about the BSA is my question, not a reply on air.
I agree, we sometimes get early descent to avoid conflict, but usually we have already spotted this on TCAS and also by being observant as to who is who coming off the ocean. In this case, I normally offer a level change to help.
While the BSA's work in reducing holding at destination, all I ask is for some consistency. If it's 10 before, publish it, let's not make it a restriction on the whim of a controller
Out of work, I sit on an airspace group to help coordinate ATC and GA aircraft. I also do Fam Flights for ATC so really, I do my bit to help !