As a domestic connecting passenger, I have often worried about the removal of the fast track, for passing the UK border, however, the queue has always been small, so no real hassle.

Until yesterday. There was a massive queue, which did have me wondering if I should just exit through the e-gates (no queue) and go back through south security, but too late, I was committed to going through. However, I failed the BP check before the border and the nice lady reprinted a new one and then let me use the express connections lane (after I made a few (nice) comments about the size of the queue and the removal of fast track), saving me a considerable wait. A colleague who arrived about 45mins before me had just gotten through the same queue.

I'll seriously be thinking to exit next time and come back through security.