English mild with 1.5 oz late addition centennial hops? Like Alchemist said, I'd just do a single bittering hop addition - preferably Goldings, Fuggles or Willamette.
Why the light crystal? I'd use a slightly smaller amount of darker crystal (preferably English) unless you want to use up some of your existing stock.
Cara-pils? I'd drop it. English milds usually have very little head, and poor head retention, although in Northern England, they may use a sparkler.
See BJCP 2008 Style Guidelines - Category 11
I like mashing at 150, but you could up that temperature a bit if you want to. I wouldn't go over 155.