Pug,
Mate i have worked and been on Henderson books since 2008/9 they where and still are a good company, they did go off the scene for a while especially within the maritime transit sector due to the lack of work, this was also due to the fact that Henderson didn't want to drop its wages, professionalism standards etc etc so to that end the pulled back instead of sending lads out on task on crap wages, lack of information, crap kit etc etc like so many others have done.
Be aware that they do have other avenues of employment in other directions of security.
Bevs
