Psychedelia, going right back to its roots in the counterculture age of the 1960s, has always conjured up pastoral images of rolling fields, Itchycoo Park, and kaleidoscopic images running freely in the sky, with or without diamonds. In other words, the stuffy dark wood interior of a traditional British pub is about as far away as you can get from psychedelia. Yet, one of the finest psychedelic bands of 21st-century Britain was born, not in a s…