USE as well….
I tried this with my gravel bike, in order of preference UK made, UK designed, everything else you need.
Frame – take your pick, lots designed in UK, far less are made here, but they are out there
Fork – designed yes – made? Much harder
USE seat post, bars, stem, bottles
Hopetech rear cassette, brake callipers, discs, hubs, BB, headset and seat clamp
Saddle fabric
Wheels built in UK but DT Swiss rims and spokes
Bike build at LBS
Lights Four4ths
Yes it’s got an Easton crankset, and a Shimano Ultegra hydro / XTDi2 combo
Bar tape ? Fabric