A reed warbler this morning seems a good candidate for the latest Welsh record.
Otherwise a quiet day with 2 jack snipe the highlight of the ringing session. See: gowerbirdringinggroup.blogspot.co.uk/2016/11/the-latest-welsh-reed-warbler.html
A bittern reported yesterday from the South Pond area
Glamorgan Bird Club 
Excellent record Owain. There is 1 record in November for VC41, at KNNR on 1st & again seen on 5th 2002. The latest rec. for West Glam. I have on the database is for 1 at Nitten Field 14th Oct 2010 (trapped for ringing), however there maybe other records as yet not on database. BS may be your man here. (GRC/GRC data)
Thank you. Barry has confirmed the latest record he is aware of is for 5 Nov, so may well be the latest for VC41. We caught birds on 15, 22 and 29 Oct as well this year, so a few late ones. Cheers, Owain