CaeT, it could be that it has just grown that's all. But, did it get dry during the summer.? This is when the flower buds form. If it gets dry the camellia will not form flower buds. Sooty mould is caused by aphids. Try to clean leaves as thoroughly as possible them spray early spring with systemic insecticide. It's a vicious circle.....Aphids, sooty mould, aphids, etc. sorry. Ailsacaig, just noticed I have repeated some of your advice