I did this almost 2 months ago, thought I'd write up a blog-like for these young 'uns which might copy my foolishness.
The Brompton's specification was a 2003-vintage short-wheel-base with 6speed, rack. I had customized it via fitting a 28T inner chainring to the 50T chainring on a longer bottom bracket, a Steve Parry Braze-on seattube and a front deraillleur, producing a 12-speed. I own 3 Bromptons, the other 2 are a 2-speed Titanium for home/train/work type multimodal, a 12-speed with Schlumpf Mountain Drive which was in California, and this old one I kept as a UK bike when I visit. Since this trip I sold the Brompton to a fellow enthusiast and have ordered a new Brompton. My intended end-setup would be a S6R with the Schlumpf for long day touring type situations, a S6L-X with the newer BWR hub for more local day rides where its hilly and the M2L-X for short lots-of-folding/carrying multimodal daily use.
The issue with the Steve Parry / front derailleur setup is the crankset bends easily under my fit legs force so have to shift to the inner chainring on uphills and the holes where the inner chainring bolts on were becoming stretched with the steep hills force. I did buy the Mountain Drive to get around that problem, but that bike was in another continent.
The weather forecast was for unseasonally warm and generally dry but I've learned in the case of the Lakes to not trust the forecast and brought full waterproof gear and warm layer, just in case. I never needed to wear it as it turns out, was warm and sunny most of the time.
My camping gear... bought over some years begins the tent as a Terra Nova Laser Competition. At the time the lightest commercially available 2-skin tent with porch just big enough to fit a folded Brompton - I tested this fact by biking to the dealer on my Brompton, erecting the tent in the store and placing the Brompton inside. The bike needs to be central in the porch to not be touching the outer skin but during the times I need to get in/out of the tent I push it to one side and that pushes the outer skin. I place the Brompton in its cover to help protect the Brompton from condensation and protect the fabric of the tent from the sharps bits of the Brompton.
The sleeping mat was a Neoair All Seasons, noting this was mid-September and valley temperatures can drop to freezing but turned out it was mild. My sleeping bag a PHD Minim 300, with 300g of 800fp goose down, no zip, to not puncture the airbed and to for minimum packed size/weight. I had the sleeping bag in a dry bag with an eVent fabric base so I would squish the sleeping bag in, roll down for waterproof and then squish for slow air removal through the fabric so it would become shaped by the other gear and have the smallest packed size. A good warmth/weight/volume combination. Combined with the mat, would have me cosy to freezing.
My stove was a Trangia, the smaller size, which is the dinosaur in my kit, massive, heavy, but bombproof. I intend to get a Caldera Cone at some point, but I'd forgotten before this trip.
My waterproof gear was a Paramo Quito jacket, the best cold wet cycling jacket I've ever owned, massive pitzips to vent when warmer, sleeves wide enough to cinch above elbows, or close it all up and out up the brilliant hood for cold wet long ride. The trousers OMM Kamleika, narrow to not foul in the chainring, waterproof. I made good use of a Montane Slipstream gilet for "just enough" insulation in the cooler clouder cooler days.
My luggage is an old style Brompton Touring Pannier. Massive. It droops now when its not stuffed due to years of being my shopping bag (damn those buy-one-get-one-free supermarket offers!) but for this stuffed trip it was fine. On the back a Carradice Rackbox, cheap, no longer made. The rack of the Brompton is a harsh place and makes anything solid noisy so I put my soft lighter stuff in it which was the sleeping bag, the mat, silk liner, a foam sit mat and a synthetic insulated gilet if it got chilly. All the other gear went in the front pannier, easily fitting.
I had a 3L water pouch as I knew I'd have some hit hill climbing and need plenty and I strapped a bottle cage to the handlebar stem which I decanted into from the pouch.
Day 1, bike / train / bike.
I left my mother's home town of Keighley on a drizzly Sunday morning.
I folded the bike up
and carried on the train.
Changed at Lancaster to catch the intercity London-scotland train
Changed at Oxenholme
for train to Windermere
The Sunday train service needed to change twice, during weekdays can change just once, as I did on the return.
I biked along a mixture of road and pavement with "bike path" signs through Windermere, Ambleside
to the National Trust (NT) campsite at Langdale
Unpacked and waited for dark
In the evenings I planned on catching up with some comedy shows on my old Ipod
which I recharged using an external battery charger, one set of fresh AA batteries lasted the whole trip.
It was light drizzle as I got Langdale which I was sure was just a little local rain as the valley was surrounded by sunny skies but proved to be a wet night, raining all evening and until dawn
I spent the morning thinking about would the Brompton cope with my intended next ride, over Wrynose and Hardknot Passes. One voice in my head was "are you crazy! on a Brompton!" another voice said "he who dares wins" and I wrestled it into a decision to at least try, if I'm defeated I'll turn around as what goes up can come down.