I want to buy tv for dining roomapprox20inch say.do they have inbuilt ariels so all I have to do is plug into mains or is it more complicated and I have to get someone to set it up. Where can I buy one if this is so
No TVs (as far as I know) have built in aerials so you will need any aerial if you have not got one in that room.
If you live near a transmitter an indoor aerial may do.
You should not need anyone to set up a TV as most will "auto tune" to the channels after you plug it in and switch it on.
You can buy one at many supermarkets nowadays (my local tesco and sainsburys both sell TVs), or Comet, Currys, PC World, Argos or any other electrical shop.