A four-piece outfit located in Croydon, Surrey, Britain, through the latter area of the 70s, Main Medical operation comprised Don Weller (b. 19 Dec 1940 Croydon, Surrey, Britain), Tony Marsh (drums), Bruce Collcutt (bass electric guitar) and Jimmy Roche (electric guitar). Roche acquired a blues history, having been a short member of an early on Colosseum line-up; he eventually joined up with East Of Eden, where he used Weller. This set also played collectively in Boris before developing Main Surgery. Thus, Main Surgery drew within the blues, rock and roll, and avant garde music, reconstituting them like a muscular mixture of intellectual electrical jazz.