“While it is not necessarily a criminal offence to photograph a completed ballot paper either at home or within a polling place, it is strongly discouraged as it could violate the secrecy of the ballot, which is fundamental to the integrity of the process.”
So, is it illegal is it not?
Well, the only illegality around it (according to the Electoral Commission and the Referendum Act 2013) would be if you do one of the following.
Being disruptive as judged by the polling officer at the particular station
Taking a photo of anyone else either purposely or by mistake (misjudged selfie)
However chances are if you have a postal vote you’re not in a polling station. In this case, you can share your postal vote all you want, as long as you don’t share anyone else’s, induce others into sharing theirs or share others photos without their prior permission.
So – photos in polling stations you’ll have to follow the rules as laid out in the referendum act to avoid breaking the law. Photos of postal votes are perfectly fine, although discouraged.'
http://www.scotlandvotes.com/news/ar...elfies-illegal