I repeat.
In UK law a person who has been lawfully married can never have the marriage annulled.
If a legal definition of a person whose marriage as been annulled has been requested from a lawyer then they will be told they have never been married, thus are single.
If the proceeding were in the Philippines then the person asked would need to know the circumstances. If the marriage never took place then they were never married. If the marriage was legally accepted but then an action was taken to annul it under Filipino law then the position of those concerned cannot in UK law be considered as single. That refers only to someone who has never been married, ie. in a legally accepted ceremony.
Most so called annulments in the Philippines are in UK law divorces.
(I am a former UK Detective Chief Inspector)