Form tweaks

The form requires a few tweaks, the revised designs are available at:

* ~~https://www.dropbox.com/s/bykpjwd3ef7exrp/20140320_160912.jpg~~
* ~~https://www.dropbox.com/s/v8ngpyewyg2bvg8/20140320_160919.jpg~~ ~~now: https://docs.google.com/a/caret.cam.ac.uk/file/d/0B9M-SeeuofkNTVdmNDFYU1VKQ0E/edit~~
* (Photos as scanner is currently inaccessible)
* Now: https://drive.google.com/file/d/0B4dHvow9JoMha0FwNmRjRDhtNFU/edit?usp=sharing

The changes to the T&Cs are being checked by John so they shouldn't be implemented until he's given the green light..