EFFICIENT BOOKS LTD Company number 10715234 · Monitor this company Active Overview People 2 Financial Control Documents Analysis Location Related Registered office AddressSuite 18, First Floor Winsor & Newton Building, Whitefriars Avenue, Harrow & Wealdstone, United Kingdom, HA3 5RN PostcodeHA3 5RN Companies at this postcode 277 Average house price in HA3 5RN £455,000 (20 sales) Map