- Barr Associates, Ltd.
 - Design and manufacture of infrared optical filters. - Cathodeon
- Specialising in spectral source technology. Offers cathode, halogen, and other lamps and sources for OEM clients.
- Gooch and Housego (2)
- Imaging Associates
- Specialises in biomedical, materials science, and cytogenetic imaging, providing microscopy solutions for digital image capture, image analysis, and documentation.
- Laser Beam Products
- Manufactures mirrors for high powered lasers and CO2 laser cutters.
- Oldham Optical UK
- Manufacturer of mirrors and other optical components to the amateur and proffessional market.
- Optical Vision
- Importer, exporter, and distributor of a range of scientific and consumer optical products.
- Precision-Optical Engineering
- Diamond machining of reflective & refractive surfaces. Manufacturing of interferometers and laser beam monitoring equipment.
- Scitec Instruments Ltd
- Design and manufacture optical choppers and lock-in amplifiers.
- Solatell
- Sells ultraviolet spectroradiometers in a variety of forms.
- Wilkes Iris Diaphragm
- Designers and manufacturers of irises for use in many applications.
- X-Ray Dynamics Ltd
- Designs and implements phase retrieval algorithms, including associated software and hardware. Produces equipment for the passive generation of coherent x-rays and light.
- X-Ray Technology Group
- Manufacturer of low power x-ray tubes and sources for industrial and medical applications.
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