Here are some useful links and resources. Some may require College log-ins, but most are freely accessible.
Original dissection protocol, although now updated by AECVP guidelines.
UKCPN original dissection protocol
Chapter 8 NSF:
http://www.bcis.org.uk/resources/documents/nsf_chap8.pdf
Autopsy heart guidelines RCPathology: http://www.rcpath.org/resourceLibrary/g145_gapcardiacdeath_jul15-pdf.html
General autopsy general guidelines :
https://www.rcpath.org/profession/clinical-effectiveness/clinical-guidelines/autopsy-guidelines.html
Royal College Pathologists:
Royal College Physicians:
Coroners Society:
http://www.coronersociety.org.uk
Human Tissue Authority:
Ashley Jolly Trust SADS Trust:
Cardiac Risk in the Young (CRY):
Cardiomyopathy Association: