Below you can find a great list of websites to add your running race: Enter Road Races in the UK, you will also find a useful road race listing section on most of the websites with online entry built-in:
Run Britain perfect website for all your run listings, the high-ranking very informative run Britain website also has lots of educational info.
Run though.co.uk is a perfect running event platform for race directors to place running events.
What a super website for listing your running, walking, or charity event, perfect for gaining participants to sign up.
Find darace.com has been around for a while online, it’s a very good website service for listing running events.
What a very good website for adding your event, swimming, running, walking, and more.
If you are running a trail event the tra-uk.org website is perfect, its got plenty of helpful tips, it also offers some very good general advice.
If you visit the time Outdoor website you will find an amazing arrange of great advice, for running clubs and any other clubs. you can find some great options for listing your events, get your event listed with them.
Wikipedia offers loads of links, options, and advice for running events.
Brookitzone is a fantastic website offering an online event entry service specializing in UK distance running events.