So, I looked up local running groups and two came up. One seems quite serious (i.e. too scary!) and their beginner group runs on a monday. Monday night is Zumba night, can't give that up! The second group seems very friendly and got back to me really quickly. They meet on Tuesday and Thursday just round the back of my house! Tuesday though is also Zumba night... Am now waiting to hear back if just going to one a week, not both, is ok.
Not concentrating too hard on training for the half-marathon yet. Focusing on getting to 5k first.
Next run is tonight and can't wait!