Have noticed a few questions/comments about these roofs and wonder if anyone can help on this one: we have a fairly large cons. with 'pea shape' and oblong shape 'sun-lounge'. The 'valley' between the two shapes was always a problem with our St Helens Glass-installed poly c roof, (as well as many other leaks, appearance, noise, etc), and we went for the (expensive) Guardian Roof system fitted by Phil Coppell Ltd. Initially very pleased, although puzzled that the 'valley tray' fitted for their system was installed with the sides of the 'tray' overlapping the tiles instead of, as you would logically expect, sitting below the tiles so that water could pour off the tiles into the valley, instead of the water pouring under the side pieces and potentially under the tiles. The boss of the company came at my insistence(Phil Coppell) and insisted the installation was correct, although couldn't explain why, as the only water flowing down the valley tray was the rain drops that landed on it. Now, guess what, after the current wind-driven rain, the roof is leaking! £8000 spent for a roof that still leaks! Does anyone have a Guardian Roof with valley(s) that could confirm whether their installation is the same as mine? Also, does anyone know who the manufacturers of the system are(PCL are only the UK agents and do not manufacture the components), so that I can check with them. I believe they may be an Irish outfit.