LJ OPERATING SYSTEMS LTD Company number 17249157 · Monitor this company Active Overview People 1 Control Documents Analysis Location Related Registered office Address1 Allied Business Centre, Coldharbour Lane, Harpenden, England, AL5 4UT PostcodeAL5 4UT Companies at this postcode 431 Average house price in AL5 4UT £684,000 (2 sales) Map