Hi Myouse, you don't say what the query is on your cherry tree. Is is lack of fruit, something wrong with the leaves or worse still, a dying tree? If you are a bit more specif they are loads of really specialist people on here will will gladly help.

http://www.gardenfocused.co.uk/fruitarticles/cherry/variety-Sylvia.

This link says its normally self fertile but does better with a pollinator. There is a list of suitable ones.

If your tree only flowered for the first time this year, that suggests its young - how long has it been planted? Add your reply by clicking in the empty box below this one, beneath 'How do I say thanks' - it will expand and allow you type in it,rather than posting your answer as a separate question.