With all due respect, RatherbeFlying, ATC have never had the right to "interfere" with TCAS, full stop.
In this particular instant the controller working that night did not "interfere" with the TCAS RA, but rather used the information available to him ie a mode C readout which was several seconds behind the actual vertical movement of the aircraft in question.
Most controllers in the world know that TCAS has priority over their commands. I, as a controller, am happy to work with the backup of TCAS, as I know that its' information is faster and more accurate than my radar processed and therefore delayed representation.
The BFU reccomendation would be another link in the safety chain to avoid further incidents.
It will be interesting if this reccomendation will be pursued by national and especially cash-strapped privatised Air Navigation Service Providers!