In order to practice operating in such a damp environment, Dr Matt headed to his favourite croissant shop, Condor, and stocked up with saddle bags, alloy stems and, most importantly, Crud Roadracer Mk 2 (with Deano Downing on the box). Jez pointed out that they now took Amex, for those interested. And the chap behind the counter told me that Carradice bags (wot I had purchased) last for ages: his parents still had their from their honeymoon. Not sure what I think about that.
All are now affixed, although some saddle swapping will be necessary tomorrow. And for those who wrestled with Crud Roadracers before, fear not: the new ones fit very easily. Dr Matt can now ride anywhere in the pack: fellow Trois V members, please adjust your SKS's accordingly.