Not Long Now
You ask <<It seems, as I read it now, a TCAS RA is a SSE2. Now they occur every now and again usually due to high rate climb/descent. No error on anyone's behalf, no loss of seperation, just life. How are they going to be stopped?>>
For an event to be graded an SSE 2 in a prescribed separation environment (radar control, radar advisory, procedural control) it has to involve, among other things, a loss of separation where the separation provided was 66% or less of the required separation. If a pilot receives a TCAS RA and responds to it but there is no loss of separation it won't be included in the SSE scheme and therefore won't be an SSE 2.