GRP gully leaning in the wrong direction

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Hi all.

A customer has a parapet wall with a 1000mm long GRP gully which should run down to a hopper. At the non hopper end is an old chimney. Unfortunately, the gully tilts in the wrong direction and the water pools at the chimney end. He says that he has a leak indoors at that point. This morning, at the deepest point, the water was about 8mm deep.

Any suggestions on how to rectify it without too much disruption. I am not a roofer and so don't want to have to lift the tiles to remove/replace the gully. Is there a super thick resin that can be used, or perhaps, could I cut some uPVC, pack it out and then either GRP over it or just seal it with CT1?

gully photo from LHS.jpg

The above is taken from the chimney breast. Not visibible is the (lead) exit to the hopper. (Photo taken today and not yesterday).

gully photo taken from LHS.jpg

The above is from the hopper end, running up to the chimney breast. Today, there was only about 3mm of water, but it hasn't rained for a while and evidently, 5mm of water had evaporated off. (Photo taken today and not yesterday).

Thanks in advance.
 
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