Sinclair C5 with Sinclair claiming that he had found "very big" levels of interest. Hoover were sufficiently persuaded to allow Sinclair to divert 10 of their employees to modify C5s for overseas export. The bid to sell the C5 abroad failed; the Dutch National Transport Service told Sinclair that the C5 was not suitable for Dutch roads without improvements to its braking system, the addition of more reflectors, and the inclusion of the High-Vis Mast as part of the basic package. Most of the other ten countries that Sinclair inquired of demanded similar changes. The C5's reputation received a further battering when
Clive Robbins and Clive documented their observations and techniques in painstaking detail, making and transcribing recordings of their sessions. When Paul left Sunfield in June 1960 Clive accompanied him, gripped by the urge to continue what they had started. They visited 26 curative homes across Europe, giving illustrated presentations and live demonstrations of their work, then spent the next six years in Philadelphia exploring and establishing the work which they called therapy in music. A research grant from the National Institute of Mental Health supported them in this. There followed seven years in Europe where Paul and Clive worked as Lecturing Fellows