Sainfoin - beside the A259 - Bishopstone - 16.5.2015

I think that this may be the Common Restharrow, but the stems seem to be too long. I shall be very happy to change the caption if a more knowledgeable wild flower enthusiast can provide the correct species.
Thanks to Fortesque28's efforts this has now been identified as Sainfoin, This looks like an early, not-fully-formed flower head. Generally they are larger and more conical, which is why I didn't find it in Sarah Raven's large 'Wild flowers' book.