Thanks Keith, I think 298 and I have seen all of the sequence on there, although it there are any more elsewhere we'd be delighted to learn of them. However, I suspect that it was such a minor event in the teeming business of the Met that it failed to gain the attention it might have done. After all, where else in the UK would a two wagon siding attract such interest!
There's a little bit of a mystery in my mind relating to the 1961 sequence. It is usually described as the last delivery, which implies there was a final collection which went unrecorded at a later date. Although it's possible to work out from District Dave when the "coal train" ceased to appear in the WTT, I'm not sure that necessarily gives a date to the final run.
In the timetable it was apparently described as the coal train right to the end, even if, by that date, it perhaps only conveyed outbound rubbish to Croxley tip.