Joking aside, I have had a Trigger on the boat caught by Bournemouth Pier.
Like all Triggers, they feed mainly in one small area and at a certain time of the tide running.
The skill is knowing where and when to fish for them!!!!!
To prove this, when I was snorkelling in Barbados, there was a small concrete jetty by the hotel. At the end of the jetty was about 10 feet of water. Amongst other fish there was a Trigger that would visit at certain times of the day and at exactly the same spot.
So the answer to all of this is to get your Budgie smugglers on and go hunting, that is if you are that desperate to catch one !!!!!