In late 2015 ESIS’s parent company Aquatronic Group Management Plc acquired the share capital of Manchester based PSI Inspection Services Ltd. PSI’s client base is mainly in Northern England and Wales and the acquisition helps strengthen the existing client base of ESIS and provides additional support to PSI’s clients in Southern England and Scotland. On 1st October 2016 PSI was incorporated into ESIS and the name will be phase out in favour of ESIS.