Marks & Spencer

GSA is proud to be the longest serving supplier of cleaning services to M&S, growing and evolving alongside them to continue the business relationship.


GSA provides daily store cleaning for Matalan across its estate in stores that vary from 8,500 to 44,000 square feet in area.

John Lewis Reading

John Lewis Partnership

GSA provides a range of services to the John Lewis Partnership, including cleaning of stores, distribution centres, waste baling and compacting, office cleaning, and even a leisure centre and golf club.


Dixons Carphone

Following a highly successful initial 2-year contract, the Dixons Carphone awarded GSA a national contract, increasing our portfolio to 420 Currys and PC World stores across England, Northern Ireland, Scotland and Wales.

Highland Spring

By 2004, Highland Spring had grown into the number one brand of bottled water. This is the story of our work together.