hi Nick - what is the problem exactly?
I'm up in Surbiton (20mins) but I wont be at the house with the car until 17th April. I do have my old DI pack still which only had a very slight misfire under full Aero boost that you could have (not sure how I would get it to you though) If yours is really bad then this might be an option?
can't believe I didnt notice the previous post that I even answered! - Its friday . Ok - worst case I can post you my 'old' DI cart. You'll probably not even notice a problem with it as it only failed at 1.08Bar pressure.
Maybe try to get someone with a truly working that lives in Guildford though. PM me if you want more info.