(01 Jan 2016, 9:16 pm)citaro5284 wrote I cannot remember if the number on the nearside comes under a 'regulation' or 'best practice'.

If its under best practice, then no, but if it is a regulation, then possible, but I doubt they will get fined (or any other operator) in the first instance.

(01 Jan 2016, 9:19 pm)LeeCalder wrote I believe it says that the number 'should' be on the nearside.

I have found it....it is under best practice:

Best Practice 
A good destination and route number display will be clearly legible by day and night and commercial advertising should not detract from them. A consistent display design is also helpful, therefore the route number should always be to the right of the destination when viewed. Other major points on the route can be included but they should not detract from the clarity of the ultimate destination. Destination displays which simultaneously show both ends of a route are confusing and should be avoided. The destination appropriate to the direction of travel should be displayed or if a circular route such information necessary to identify the direction of travel.