BMI48C apparently lost RT contact over the south Midlands and sparked a live QRA
Two Typhhons were launched and the a/c was intercepted as it made a wide orbit over the Midlands.
For some reason on loss of RT the 737 made a 90 degree turn onto west in the Leicester area ,across the airways.
The QRA sorti haled the a/c on guard , spotted that lights were on in the cabin and once the flight was back with ATC , abandoned the intercept.
Apparently the lead Typhoon came within 200 feet of the 737 , which I understand is normal procedure.