[VMPhil]

Well that BBC clip is absolutely fascinating because I'm pretty sure that is in fact the very first announcement on BBC television that Kennedy had died. This article by Kif Bowden-Smith has a bit more detail of what happened before and after but the announcement is pretty much the same as the one he'd remembered.

For context - the newsreader was John Roberts, a relief newsreader from New Zealand who had a very brief career on BBC TV (June-November 1963) though this doesn't seem to have been because of any criticism of his approach, in fact this page contains a letter of high praise for his role on the night from the BBC TV news editor of the time. Roberts ended up presenting the coverage because all the high profile newsreaders and news staff were at the Society of Film & Television Arts Ball that evening.