British Sitcom Guide:
"We run a free mailing list for comedy writers which you are more than welcome to join (in fact we'd encourage it!). About once a month we sent out a newsletter to the mailing list letting everyone know about the new features and articles we've added, detail new course listings, fill you in on the latest writing related news and also sometimes mail special features too. Additionally we include any writing jobs & competitions we hear about as well!"
I would very much encourage joining the list as well.