I really don't think you'll get much for that amount. Video tripods with fluid heads will start in excess of you budget I think.
But the best answer to your question will depend almost entirely on what camera you are going to place on it. With your budget in mind I'm assuming your camera has a value less than £500 (UKP) and is not heavy.
I have no vast expertise or experience in tripods (video or otherwise) to critique one over the other but I spent some significant time at the video forum this Jan looking and playing with tripods for my video camera and chose Manfrotto as my tripod of choice.
Just had a quick glance at a couple of video editing stores I have bookmarked and the cheapest either of them stock is this
http://www.libeceurope.com/acatalog/Basic_Products.html