[Davros]

I missed him at first as well. I went in with the usual tack of get your back to a wall fast. I ran into him later - the meeting is triggered when you wander into a certain locale. From memory, start at the Trynton exit. From there, follow the road directly through towards Crock's place. There is a signpost on the road (quite early on) - it was somehere there that I got accosted. Have fun.