Tcas
Today when working Brest Control we heard a UK LoCo call "TCAS descent". The Brest controller said "Negative, Negative, maintain FLXXX, the aircraft will be levelling off a 1000' above you." Quite rightly the LoCo continued his TCAS descent and told the controller so.
In light of the tragedy over Switzerland a few years ago I can not believe that a controller would actually try and tell a pilot to ignore his TCAS.
I am amazed and admire the pilot's tolerance of the controller. I hope that an MoR was not only filed about the RA but also about the standard of ATC.