Sorry to cause a fight...lol!
Just to clarify...when I said I tried both suggestions, I meant tried the two suggestions from two different posters. First one to change to 8.8.8.8 & 8.8.4.4 and the second suggestion of 208.67.222.222 & 208.7.220.220.
I've actually tried 2 different routers. My own newish one that's been working fine for a month and one a friend brought over that has been working fine for him (he let me borrow it briefly just to check both routers were getting the same results). I have also asked Orange to send me a replacement free one (since they won't seem to help unless I am using their router).
Just also to confirm....a neighbour a few doors down who is also with Orange has been getting these exact same problems as me also since late Thursday evening (when my problems started).
Just want to say thanks again to everyone who has tried to help