elphinstone research centre elphinstone research centre elphinstone research centre is a medical research centre, part of the charles river laboratories, east of edinburgh, south of tranent, in east lothian. in the 1970s, it was the site of inveresk research international. inveresk had been founded in 1957 and was situated in the former offices of the institute of seaweed research. it is situated to the south of tranent, between the b6414 and b6371, north-east of elphinstone. the site employs around 1300 people.