I would like to thank Alun for his informative post and ask him a couple off questions.

I am fortunate to have very good signals from my local transmitter so have been on digital for some time - however my tele is reaching the point where it is going to be replaced. One consideration is whether there is likely to any advantage in changing over to freesat at the same time - more expensive obviously but are there any advantages. The other question is on HD - obviously on a tiny screen HD is meaningless - at what point does the extra image resolution become worthwhile.
thanks Ralph