Thanks people for the all replies.
I will be looking into the option of sender for the ability to change the channels as firstly it was not my primary concern.
However i seem (touch wood) to have solved the problem thanks to a few pointers here.
As Paulyoung mentioned my box is a pace box with two rf outs but neither seemed to work properly, the first would work with a crap picture upstairs and the 2nd would give nothing.
So i furthered this idea and found that in 'Services' option 4 then 0 then 1 and there is an option to switch on the +9v.
This did not cure the problem.
So I then took out the terrestial "aerial in" and boomshaka the RF out worked with perfect pictures upstairs.
So I can now leave this in and not have to bother switching cables as the main TV downstairs works with the cable in and I dont have to bother switching them at all.
Only downside is though the ability to change channels from upstairs which at first I was not too bothered about but if a sender does the job then I will be well happy.
Thanks again.