As it arrived and is Freepost to return, it seemed just as quick to fill it in. Your online link is on the census anyway, so you still need the paperwork! (Unless their is another way of getting the link)
Like the two above, it is completed apart from the one about if someone is staying on 27th March! I cannot be sure yet and remember this coming up on previous Census forms. But we are not supposed to post it before 27th?
Done mine already as I'm off on holiday Sunday and won't be back until 27th. Unless Spanish Air Traffic Controllers go on strike it will all be truthful. If they do decide to walk out I will have only told a small fib as we live there the rest of the time anyway.