Bathroom Lighting Circuit Spur?

[RDP]

Perhaps someone could clear this up for me please.
I am about to install a new lighting circuit in the upstairs of my new extension. This will include the lighting circuit for two bathrooms.
I seem to remember reading somewhere that lighting circuits could not continue on from bathrooms to other rooms and had to effectively be a spur that ended there.
Is this the case, or can I happily work the circuit round the rooms in what ever order I like.

P.S. BC are aware.

 

[Spark123]

Not that I have heard of, are you also fitting a fan?

 

[stem]

As far as I know a bathroom doesn't have to be "a spur"

Many installations make the bathroom like this, or as the final light on the circuit because it's easier to run the cable to the ceiling mounted switch and then on to the bathroom light, no need for a junction box, as there's no cable to run out to another light.