A wireless AV transmitter is probably what you need. Two boxes, a transmitter that you connect to your DVD player (you can also connect regular TV antennae, vcr or games console) and a reciever that you connect to the TV. The signal is wirelessly transmitted to the TV. You will probably need a power supply for the receiving unit but it will be neater.
You can pick them up in Argos:
http://www.argos.ie/static/Product/catalogId/1500002201/partNumber/9004296.htm
or most electrical / TV stores. There would allow you to have the DVD player / sky box in another room if you needed to.