Soil analysis and bio-remediation rops

My garden is the site of an old iron foundry works and was used as a dump just after the war. Im concerned about heavy metals. Does anyone know of cheap reputable soil testing companies in south England where i can get the soil examined, and can anyone confirm or refute the claim I remember reading somewhere at college that Salvia sclarea is a bio-remediation crop which could extract certain metals???:cnfs: