I have a three year old Victorian style, South West facing, conservatory with a leak problem where it abutts to the building. Pictures uploaded to my profile. .The original builders (now bust) installed the flashing too high so that it does not protrude down onto the perspex roof panel but rests on the pvc spar. About a year ago i got another company (also now bust !)who lifted the existing flashing , removed and replaced silicone sealant between the conservatory and the wall , inserted a lower sheet of lead underneath (though i think this has not been raggled into the wall) which now covers the pvc spar but does not lie on the perspex. They also replaced all the lead sealant. It only tends to leak in heavy rain and driving wind with the water not dripping from the roof line where it abutts the wall inside, but from the lintel above the entrance door from the building . The plasterboard accross that wall is evenly stained which would seem to indicate the problem is with the flashing not between the perspex and the pvc. Looking at the flashing i can see that in some places the sealant has cracked particularly at that tricky joint where the roof peaks and there is a square patch of lead covering the top of the two slopes. I have had a quote from a tradesman to replace the flashing for a few hundred quid but i am wondering whether i shouldn't first buy some lead sealant and try to re seal some of the joints myself before spending that sort of money? If it still leaks i've only spent £20 or so and can then go for a full repair. I am aware that the perspex roof will not bear weight and i will have to get crawling boards and ladders. Can anyone offer their thoughts ? Any advice welcome. Thanks.