Liberty Security Fencing have been felling their well-regarded product for a number of years.
They seem to have found a niche because of their use of timber rather than a more traditional steel frame.
Apparently they chose timber because there was a lot of rough second hand timber around at the time. This meant they could produce something that was sturdy, but was not ridiculously heavy, and was unlikely to be stolen as a source of scrap metal.
Due to customer response they have stayed with timber, buying direct from some of the timber concerns who supply the mining companies with pit props.
As a customer, LSF is valued because they want sizes and grades the mining companies have no use for.