No I think you've got it all covered. Obviously you get the front luggage bag, a carrying bag and an under-seat pouch to store it while riding, but I doubt they've been included in the weigh in.

One thing - Merc use thinner rear spokes than Brompton have since 1990 (14 gauge rather than 13). This is becoming a matter of regret for me, since a second one twanged yesterday. Then, as if that wasn't enough, I stupidly punctured the tube while putting the rear tyre back on after fixing it.... I might have the wheel rebuilt with 13 gauge spokes. It's a pain having the damned wheel off twice in sixty miles for the same problem. The Brompton spokes are dirt cheap at £0.26 each.