I found a website yesterday that contained an A-Z list of job sites and agencies in the UK. However within that list there were some links to sites that offer good advice and support to industry professionals and people starting out. Hopefully these will be useful to some of you.

https://bectu.org.uk/topic/careers-and-skills/

https://creativeaccess.org.uk/individuals/career-support/

https://www.pma.org.uk/

https://www.screenalliancewales.com/vacancies/

If I find more, i'll add them above. In the meantime, If anyone else has a link to share, pop it in the comments! :-)