He was attack coach (IIRC) for the 2003 side, so I think he will be of good use. Especially considering that's England's weakest area- they're miles behind that side. I like that Lancaster's man enough, as it were, to bring in someone else to have a look. I hate the idea he'd make the coaching team an introverted clique.
For me Ashton's one of those coaches who's terrible in charge, but very good working under a management-type head coach. Andy Robinson's probably the same; great as forwards coach under Sir Clive, but absolutely naff when trying to head things. If Ashton's there for a few days --with Lancaster keeping his hands out of the cookie jar-- he can't exactly do damage. And if he manages to throw in a few new set-moves, or teaches Barritt how to pass, then so be it.
That's why I hope when Lancaster eventually goes the RFU don't make the same mistake they did in 2004, and bring in someone like Baxter or Mallinder instead of promoting a deputy. Think Rowntree as head coach for two years, then Farrell for two more, then Robshaw for three after that.