Profile George Preston Location: New York, NY, USA Find out about our central heating Worcester Park here at GJL Plumbing and Heating. We offer a range of services throughout Earlsfield, Kingston Upon Thames, Worcester Park, Wimbledon and Wandsworth. Last activity: on 06/06/2020 Joined: on 06/06/2020 https://gjlplumbingandheating.com/services/central-heating-services Design quotient Earn DQ points by participating in a challenge. What are (DQ) Points? DQ points are a measure of your contributions, they correspond to how active you are in the Research, Ideas and Evaluation phases of a challenge.