I'm sure its a daft question but why couldn't you put the 2 panels that are on the right, to the right of the chimney under the solar water panels? The shading would then effect fewer panels as the shade obviously can't be to the left and right of the chimney at the same time.
Gary, Thanks for your reply. I had thought aout that but as the roof faces Due South this might give shading to these panels in the afternoon/evening. I could then end up with a problem at both ends of the day!
The installer is calling around tomorrow morning so I am hopeful of working out a solution then. I will let you all know how we get on.