Sim tech wrote,

I think that the locking intercom trigger on the yoke is compulsory on British-registered aircraft. One of the sims I work on came over from the States; it didn't have the locking facility so we had to add it as part of the work required to get CAA approval for British crews to train on the device.

I can think of a British registered B747-400 Freighter crew that wishes it had locking intercom switches! The ones we operate do not have locking switches.

If this story is for real (and I doubt it) it is clearly a joke. Not to everyone's taste, but that doesn't turn it into a threat.

So long as we get to the destination safely and in one piece, then the job is done.