BLACKSIM LIMITED Company number 10611417 · Monitor this company Dissolved Overview People 1 Financial Control Documents Analysis Location Related Registered office Address6 Blenheim Court, Brownfields, Welwyn Garden City, Hertfordshire, England, AL7 1AD PostcodeAL7 1AD Companies at this postcode 33 Average house price in AL7 1AD £830,000 (5 sales) Map