Hibiscus not going to flower?

Hi All
About two years ago I bought a sad looking tree from the supermarket that was reduced to £1.50 so I thought why not!
It was labelled as a Hibiscus... I don't know enough to say any differently so I'm taking this as true.
Two years later and although the plant looks better than it did at purchase... It still hasn't really done much. Attached is an image.
The first year it produced a little greenery that died for winter, and now it just has tiny leaves. Does anyone know if this will do any better and maybe even flower?
I've never grown these before :-)
Thanks

I'd give it a good feed and watering, it can be dry next to a wall and they don't like that, and keep your fingers crossed for a few flowers later this year..