When ever most days first time I switch the channel over to E4 most of the time I get adverts first rather than big brother first!!!!.

That doesn't normally happen to me with Big Brother, but it certainly does when browsing music channels.

uri > maybe you switch over "on the hour" after another program on another chan has finished?

That has to happen, it's the law Have you noticed as well if you flick when the adverts are on, every single other channel is also showing adverts

I have noticred that E4 & E4+ have more ad breaks than CH4.
The ad breaks seems a lot further apart when the live feed is on CH4 at night, the ads seem to be on E4 much more frequently.