Church Hill in Finchingfield is a short, sharp shock and the pub is immediately at the top. By short, I mean less than 30 yards. That is by far the steepest but it's only about 1 in 10. No one will mind if you want to walk up it - you'll be getting off your bike in about 20 seconds anyway because you'll want some lunch!
Leaving Halstead there is a climb, although I've never cycled on that road - I'm just looking at the contours. There's also a climb out of Fordstreet on the way back to Marks Tey but it doesn't look especially nasty.
I'd say, NSTN, that if you wanted a nice gentle recovery ride after a bout of lurgy then this would be a good choice. Mrs. Wow and I will be on the tandem and you know what speed freaks we are when we get going.