Overview Tullow Oil PLC. The oil and gas exploration company relocated its headquarters to an office area circa 4,450 sq.m in Number One Central Park, Leopardstown, County Dublin. The project programme was constrained and was acutely monitored using a detailed critical path model. Designer Group remained ahead of all targets and delivered the project to the client’s total satisfaction. In this project Designer Group delivered the electrical and mechanical installations in the shell & core and client areas.