you don't have to but it only takes a couple of minutes to do so and at least will stop you from getting silly letters from them for a couple of years
I had a bunch of letters waiting when I moved into my current house and a visit from some complete tool in the first week of moving in... sent said tool away and just went onto their website to inform them I didn't watch TV... two years on I've not had any visits and only recently had a letter just asking me to confirm that I still don't watch TV
+1
