S JOHNSTON PROPERTIES LTD Company number 14749450 · Monitor this company Active Overview People 1 Financial Control Documents Analysis Location Related Registered office AddressMercer House, 15 High Street, Redbourn, Hertfordshire, England, AL3 7LE PostcodeAL3 7LE Companies at this postcode 258 Average house price in AL3 7LE £469,000 (4 sales) Map