Having operated the RVSM system in parts of Scottish UIR for 2 years or so I can honestly say that there have been few TCAS occurences.
I think most pilots are aware enough of the traffic in their CLOSE proximity that rates of climb and descent have been sensibly applied and monitored.
I am sure my colleagues in London will have no problem in adapting to the changes, and in a few weeks time will wonder what all the fuss was about.
Just watch out for those aircraft that are still allowed up there but are not RVSM approved, they are the one that cause the problems !!!!!!!!
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FATCO