This video has been all over the internet. In another forum there was an ATCO (working at Heathrow I believe) who accepted the first aircraft need not have been called off, with hindsight.
I saw another emergency video at NATS which included the sound track. The audience was specifically requested to not discuss it on PPRUNE so I won't but I didn't think it was anything particularly exciting. I don't think infringing pilots would generally be on the NATS sound track; if they were it means they are in contact and they would be told to go away long before it gets serious! All you would hear would be calm instructions to transports to break off, etc.