I have killed the death claw with the Mini gun and all the Hostiles, but I can not talk to Presly, My PIP says I need to clear all hostile from Concord , but I cant find any more, am I missing something

There are probably more raiders in the buildings. Had the same problem. I think there are a total of 6 raiders about.

2 of mine were in weird places (between building and one stuck in a doorway - idiot! turn your gun, don't just keep running at the door!).

I eventually was able to talk to him though.

Careful though. If you take too long, they respawn.

I wil try looking again I have spent afew hours searching, I read on another forum that it's a glich and some have just quit playing the game, Thanks for your help and quick reply