The Rayner family has been farming in Colnbrook since the 16th Century, reportedly in the reign of Elizabeth I.  In 1945, the family purchased Berkyn Manor Farm and Manor House, together with the 60 acres of land (the site of Berkyn Manor was also the home to the famous poet, Milton, and his parents from 1632 to 1638). In 1954, J Rayner & Sons Ltd was founded from the original farming partnership.

Today, J Rayner & Sons Ltd farms over a large area from Guildford in the south, Henley on Thames in the west, Gerrards Cross in the north and Upminster in Essex in the east, with a distance of 128 km from one end to another. 
The total area of J Rayner & Sons Ltd tenanted land is 283.47 Ha (700.45) acres.