Crab;
Go fly the ILS into Oxford one grotty weekend and see how many TCAS contacts there are between ToD and DA, very few talking to Brize LARS and even less talking to Oxford. I filed on one there a while ago, he flew from a neighbouring airfield and ran a business at Oxford, his attitude was "I was in the open FIR, why should I talk to anyone?" he was aware of the ILS, but too selfish to care.
I honestly think a lot of these guys are bimbling around busy airspace IMC following GPS moving maps and have never noticed the approach symbol on the CAA charts, if they even carry them. The airspace between Manchester and the south coast is incredibly busy compared to your patch with, GA at all altitudes below controlled airspace and from what my TCAS and radar services tell me quite happy to fly around IMC without talking to a soul.
SND