Scaffs actually make a lot most of them are on 60k a year!!! good job to get in to and always required especially on the rustbucket sh!thole platforms in the northsea...
Im from a drilling side i.e downhole tools the easiest way to get in to that is roustie jobs which atlantic resourcing are good for...
But on a more mechanical side you should try RBG i know they hire plumbers