OK. Tribekey's comment explains why a 'visual only' runway can have SRA approaches. But why is an SRA considered to be a visual approach? Would a PAR also be considered a visual approach?
The distinction I am making is, it seems unlikely to be connected with whether an approach is precision or not. Perhaps it is to do with not using a radio aid?
Or is it to do with the MDA being similar to the visual circling minimum -- as it is at Norwich?
I'm still puzzled.
AA.