JOHN FREDERICKS PLASTICS LIMITED , proud manufactures of 'The Ultimate Collection' of PVC-U windows, doors and conservatories to the trade for over 50 years. Established in 1970, John Fredericks Plastics have now amassed 50 years of trading with a strong record of innovation and a loyal customer base. The company’s management team attribute the company’s longevity and enviable growth to its focus upon quality, delivery and innovation.