Slough or Watford. Either is fine with meThe key to the problem is MCAS system giving an un-commanded nose up or nose down during critical flight phases.
This could be due to:
a/ hardware fault - faulty AOA sensor
b/ software fault
c/ combination of both
Of the choices, I think that b is favourite as it's unlikely that the AOA sensors are going faulty at this rate.
Edited to add:
the AOA sensor is just a little vane connected to a potentiometer giving as current that tells the MCAS computer what the AOA is relative to the airflow. Works akin to a car throttle position sensor.
The FAA realise that if one of these goes down coming out of Heathrow or Gatwich then it's likely to make a large hole in West London with massive loss of life on the ground. The two planes that have crashed have been 6 and 13 miles after take-off respectively.
Westbound this would take out somewhere around the Windsor / Slough or maybe Legoland
Eastbound: Twickenham, Richmond, Kingston
Northbound, anywhere as far as Watford