A short report on the surveillance of choughs in the Pembrokeshire Coast National Park in 2017, by Jane Hodges and Bob Haycock, is now available as a PDF on the Pembrokeshire Bird Group Blog Site - Ad-hoc Reports section.
The records that contributed to this report form part of a series of annual assessments of breeding chough that have been made in the National Park over the last 25 years.
Thanks to Richard C for uploading this.
Here is the direct link to the report