Bill. Writing something to that effect across the paper whist not filling out ( or filling in all the boxes) results in a "spoiled vote " which has to be registered and declared in the final tally. This is a traditional vehicle for expressing rejection of the "choices "offered .
Unfortunately although still paying U.K taxes ( on a long frozen national pension) and being a U.K. citizen I am deprived of this democratic right of representation having left the U.K. over 15 years ago ( and before this law was enacted).
Not a whinge , just a statement about a constitutional anomaly.