a tick is fine, as is anything that is a clear mark for that particular candidate (I've seen all sorts, including smiley faces!)
I personally wouldn't waste my time with spoiling ballot papers as only the person counting and the returning officer ever sees them. It's a personal symbolic gesture at best.
(
h3donist tryin' to play me out as if my name is Sega..,
Wed 4 Apr 2012, 16:57,
archived)
It's surely enough to KNOW you've done it yourself, though, right?
Just to separate yourself out from the fuckheads that just can't be arsed moving because Hollyoaks is on.
(
An Eagle in Your Mind,
Wed 4 Apr 2012, 17:12,
archived)