The investment was announced to shareholders with a plan for full acquisition of Oomph over a period of time to a value of £1.8m. Stephen Priestnall, CEO, says "Cello are a dynamic marketing services group with a focus on value-added relationships with great clients. This is a perfect base from which Oomph can build its advertising credentials using the power of online information". Andy Laing, FD Navigator RA and Nigel Magson, MD Talking Numbers join the Oomph Board. Cello group.