Many thanks for your comments.
The clouds are ok, but I would've preferred lighter, more sparse clouds that turned pinkish in the sunrise, rather than the drab grey ones that filled my scene.
It's not exactly what I had in my minds eye, but i'm fairly pleased to have captured anything. Of course it was the only morning last week that was cloudy
Graeme, it was a 10s exposure @ ISO100, 33mm f/4.0.