Thanks for all the input sorry I've not been here earlier, I've not been getting any email notifications for some reason, anyway..
I'll read up on that thread about the limescale/water damage. It could be either of those I guess, hopefully just limescale, it does have that kind of feel to it so fingers crossed.
Tigerchips - I did look into those Jacob E Bang ones earlier today, they certainly seem to have a similar look, I did even find some of the same colour as well searching images but not this shape. Haven't managed to get a clear look at a base yet either.
I'll check out a possible Davidson conection as well. Thanks. Kathryn