I remember years ago that LHR used to allow a touch and go for free on Christmas day if you booked on the day. I took a couple of students on a small cross country including a touch and go at LHR. It was such a great opportunity but as far as I am aware that hasn't happened for quite a while. Christmas day was the only time as well that I was given a visual approach into LHR in an A321, we were over the Thames Estuary and were cleared to join left hand down wind for 09L, was the only time in 10 years I got a visual to LHR.