Ankle felt much better so decided to give it a try and figured I could always stop if I needed to. Spent most of the run telling myself I couldn't do it and then suddenly Sarah said I had 2 minutes to go and I then started thinking, oh my god I can do this!!
Ankle twinging again a bit now so will probably have a couple of rest days and look into ankle compression socks or similar but at least that milestone run is done and I did it!
It really is all about ignoring that voice in your head. I CAN RUN FOR 20 MINUTES! Who knew?!