Sun Microsystems Inc has strengthened its relationship with ICL by giving the UK company the contract to manufacture the circuit boards for the Sparc-based workstations it will manufacture at its new plant in Linlithgow, Scotland. The contract, with an initial term of two years, is valued at UKP20m annually and starts in the fourth quarter. ICL has one of the most advanced multi-layer circuit board manufacturing plants in Europe at its Kidsgrove base, where it currently makes the boards for its Series 39 mainframes, DRS 6000 Unix machines and personal computers. The pair will jointly invest UKP1m in board processing kit and test equipment.