"Martin" wrote in message
...

Why aren't BBC 3 &4 on during the afternoon?
--

Because during the day the same two channels are used for the BBC childrens'
programmes.
There isn't enough bandwidth available for both purposes, so they are
time-shared.

BTW There is nothing special about what is happening to GW.
It is the same dumbing-down process being applied to most programmes on most
channels.