Aren't people in danger of forgetting what that armoured door is for?
Second, and just an opinion based on nothing more than is written above, wouldn't it be very inadvisable indeed to request or accept an approach to LHR (over or close to central London) if interference was really believed to be occurring, or for the authorities to allow it. To allow that, and then shut down airspace and call out the RAF seems a bizarre mixture of ineffectual thinking followed by panic. On second thoughts, standard behaviour for a UK "security" reaction.
And further to the above point, if interference was not believed to be the case then pretty inadvisable to mention attempts to breach the door over the radio which must only result in utter and widespread pandemonium? Requesting a return for disruptive pax would be sufficient in that case.
I get the feeling that nowadays many pilots are far too free with bleating all sorts of unnecessary detail of malfunctions/difficulties over the radio to people who can do nothing whatsoever about it except misunderstand it and/or overreact...less detail is often far, far better.