Hi Karl
Thanks for helping with this. I have just tried this and it failed to make any difference. However, I wasn't sure if I should enter the 8.8.8.8 as the primary or secondary DNS? If primary, should the secondary be 0? I did try a combination of these without success but could try again.
By way of a further note, when we got back from holiday for a period of time we had to reboot the set top box quite a lot even to get the Freeview channels. This seems to be no longer an issue, but may be relevant.
I also reset the router to factory settings a couple of days ago by inserting a pin in the reset function and holding for 30 seconds without any apparent benefit resulting.
thanks Ben