Is there a recommended fly lead I can pick up (3metres ideally) for connecting my TV to the ariel socket on the wall ?
Buy yourself some Webro WF100 or similar and a couple of coax (Belling-Lee) connectors and make one up.
Can be bought from most DIY "sheds" these days, or can be bought off the reel/cut to length with loose or fitted connectors from HERE.
I'm confused, why is it on the wall? http://www.cybermotorcycle.com/gallery/ariel/Ariel_Square_Four_1954_4G__MkII.htm