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AQUA SIGNAL & TELEGRAPHIC SYSTEMS LTD

INTEGRATEDAIR SYSTEMS

THE JAMES MERCER GROUP

FIRESAFE FIRE RATED DUCTWORK LTD

MAPLE GROVE INVESTMENTS LIMITED

JAMES R. KNOWLES (HOLDINGS) LIMITED

BUILDING DESIGN PARTNERSHIP LIMITED

CARTER ELECTRICAL CONTRACTING

THE TSK GROUP PLC

OWEN ELLIS PARTNERSHIP LIMITED(THE)

FINESSE PVCU LTD

AMEC CIVIL ENGINEERING LIMITED

ALAN GORDON ENGINEERING CO. LIMITED

I.I.E.S. (NORTHERN) LTD

A V TECHNOLOGY LTD

P.& B. ENGINEERING COMPANY LTD

TORKINGTON ENGINEERS LTD

HARRY PEERS & CO LTD

THE ROSEBERY GROUP LTD

NELSON TOOL CO (STOCKPORT) LTD

REWINDS AND J. WINDSOR & SONS (ENGINEERS) LIMITED

HOLT BALDWIN ENGINEERING COMPANY LIMITED

HARRISONS ENGINEERING (LANCASHIRE) LIMITED

HICK HARGREAVES & COMPANY LTD

WILLIAM HARE LTD

D A T S (HOLDINGS) LTD

NWP ELECTRICAL LIMITED

KIMPTON LTD

KIRKHAM ENGINEERING (HOLDINGS) LIMITED

ASPIN ENGINEERING LTD