Nice - Did a semester abroad in cambridge and had quite a few of those on cask. The IPA was my first drink off the plane in a little pub called The Brook.
We know that it's Pale & Crystal Malt with First Gold & Challenger hops. 3.6%. Based on the color and taste I'd probably start with 7% UK medium crystal and adjust using maybe Marris Otter as the base.EBC is 17 so 8.6 SRM - may be able to use that to back into a Crystal estimate.
Not sure their yeast strain but that will probably play a huge part. Seem like UK brewers are a bit more secretive than US craft brewers.