Am admittingly ignorant on the subject of watchmaking or the industry in general, though fascinated by the history of Swatch (including it's later foray in car-making from what later became Smart).
The challenge is to create a rough post-war British analogue of Swatch (or another non-UK brand - including featuring certain innovations / elements from other brands of watches), ideally would prefer it derived from any OTL plans by any post-war startups or even other UK companies contemplating diversifying into watchmaking.