The Dota 2 branch of the Southampton eSports society is currently the smallest. We have plans to run an online league and host LAN events for the 17/18 year. Dota 2 is not present in the NUEL, but other national leagues are available.
We currently have no rep for 2017/18. Contact us if you're interested in running the Dota 2 branch.
You can find our Dota 2 group on Facebook