On one hand the rollout could be easy as they just have to update the logo when they buy the sandwich wrapping paper, and disposable cups etc. There are few slow moving branded items, or a vast product range, to worry about.
However, new store signage for well over 2,000 outlets can't be cheap. You'd presume franchise holders don't have to pay extra for the rebrand.
Wow, didn't know Subway was even in the UK until after the newer logo (which that shop is also showing - why didn't they change the main sign at the same time?) was introduced.
I love this sign in West Quay Southampton dating from when the centre opened in 2000 now containing 3 well out of date logos! (sorry it's a bit blurry!)