Question for LHRTim and possible dodge: IIRC you, like me, have more than one passport, one of which is non-EU.

I actually succeeded in using the FastTrack arrivals on a GB passport once, but that time and since it has been been abundantly clear to me that even the FastTrack is slower than regular EU arrivals... until recently that is.

So to my question: have you ever tried filling out a landing card with your foreign passport, and using that along with your FastTrack invite/Premium boarding card to get past the gate Nazi, and then switch for your UK passport to actually go through passport control? Might need some explaining to the immigration officer, but ought to work, no?