Can anyone help identify this valve? Can anyone help identify this type of valve? (see picture below). I've recently bought this bike and am having trouble inflating the front tyre correctly. 

Any help is greatly appreciated. 

Cheers
This is a screw-on valve extension for a standard Sclaverand (aka Presta) valve. They are usually fitted when short valves are used with high rims. But here the 3 or so threads visible next to the rim indicate that it may not even be required. Screw it off and you'll find the normal valve-head underneath. If you have a track pump with a screw-on chuck it may fit nicely, with a lever action chuck it could be fiddly.