Posted: 16/05/2013 at 10:53
I can't quite tell if this is a Jasmine plant, it loks very similar, though it could well be a common weel found in many gardens that has grown well with your care. Typically their flowers won't come until later in the year, especially seeing as this year has been so cold already. If I was you I would wait it out and see what happens over the next few months, maybe look at potting it up to minimalise the spread if it is a weed?
In the meantime if you need some other plants to replace it I've recently found a garden equipment website with a clearance sale on at the moment.