[Steve in Pudsey]

There's an argument that if the circumstances were different they might have chosen to be bolder with the new logo rather than going for a very similar replacement, doing it this way let's them do more of a phased change and update things when they need to be updated to keep costs down.

My (public sector) employer has done exactly the same thing, changing the logo three times over the last 15 years, each one being an evolution of the last. If you know where to look you'll still see signage from three versions ago around the place, and the original version refuses to die on external web content and on documents that staff who are not contacted with Marketing produce.