The Electoral Commission
They are independent from Government and accountable directly to parliament, part of their role is to get out politically impartial messages to potential voters to ensure that they know that they need to be registered if they want to actually vote. This is a link to their website if you require further information http://www.electoralcommission.org.uk/
They have produced a BSL version of their voter information booklet ahead of the Scottish council elections in 2017.
The booklet contains information on local councils, who can vote, how to register to vote and how to vote and is being posted to every household in Scotland this week.