Thank you all for your efforts to help. I will investigate a better terrestrial aerial as a simple solution to the TVs in other rooms.

I cant bring myself to junk the current large lounge TV whilst its working perfectly. As it happens, its two foot away from the incoming internet socket and we have a download speed of 39mb/s which I believe should be OK for TV. So the question is what sort of box do I put beteween the router and the current TV to allow me to watch programs off the internet. Do I really need a recording system for this - I guess I do because when I watch internet TV on the PC I download first and then watch.

I will buy a Humax box as suggested. Incidentally, does it have a program guide so you can set it up to record a series?