Hello,
A good starting spot would be to contact the following companies but prepare a proper specification for them first with your expectations. It is not acceptable to just reference some British Specification and sit back and wait they rush around trying to find out the information that you should have at your fingertips.
If these companies don't have what you want need, obtain a recommendation from each of them as to whom you should be dealing with.
AESA Cortaillod
www.aesa.ch/
DCM Industries, Inc
www.dcmindustries.com/
Hipotronics, Inc.
www.hipotronics.com/
Kindest regards,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com