If all you are going to be doing is watching .avi files or streaming a DVB tuner then you should be good.
However, if you are hoping to stream 720p/1080i/1080p with these you are going to be disappointed. S-Video and composite (and SCART by extension) only supports resolutions upto 576i (PAL).
Also 2.4Ghz is pretty much what everything else wireless operates on, including wifi. (Just pointing that out in case you get a lot of wireless interference.)
But for what it's worth, you can do this with any video sender. Don't be fooled into paying 'top dollar' because this one says it is PC specific, it's still just an s-video/composite connector.
Oh, and it's cheaper at Maplin:
PC to TV Wireless Video Sender : 2.4GHz Video Senders : Maplin