Peter Holder is moving from Westminster Abbey to Christ Church, Oxford.
https://www.westminster-abbey.org/abbey-news/peter-holder-to-be-organist-at-christ-church-oxford
In addition to Sam Bristow's move to Chelmsford, it was announced earlier in the year that James Davy will be moving on from there.
https://www.chelmsfordcathedral.org.uk/news/organist-and-master-of-the-choristers-announces-departure