Theatre Balistic Missile Defence - a new role for Typhoon?

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Before the MSAM project (Bloodhound replacement) was canned in the 1990s, the BAe submission (with Raytheon) was Patriot.
Much cheaper to have a land based system, faster reaction time than a fighter launched system, cheaper to operate than a shipboard system and you could give London the only defence against an aircraft taking off from Heathrow, Gatwick or Stansted with some AQ 'Sleeper' Airline pilot at the controls doing a no notice attack on London (No way that a Tiffy could stop that kind of attack), though the politician at the end of the C2 chain would have to have some balls in OK'ing an engagement.