Averil,

Hibiscus typically require 4-6 hours of direct sun light, fertilizer, & water to produce abundant blooms and plant growth. Pot size may have some issues with being to small, but check the root system to see if it's root bound or not. The clay pot will absorb water from the potting soil, so you might repot in to plastic.

Hi pm, I've taken your advice and repotted it into a plastic pot. It was pretty much rooted up but the soil (I think) was a bit too light so I've put it in a mix of orchid compost, potting compost and some perlite. I shall see how it goes on.
Thanx for your advice
Regards