http://www.hort.cornell.edu/department/faculty/pritts/berrydoc/blueberry/BBparts.htm (http://www.hort.cornell.edu/department/faculty/pritts/berrydoc/blueberry/BBparts.htm)
This has good pictures of blueberry problems. It is from the USA so probably you don't have the insect problems but the viruses, fungal and feeding deficiencies etc. you're probably blessed with as well.