On 08/06/10 13:24, george [dicegeorge] wrote:

Better tie a ladder up there
and go up in various weathers,
pour buckets of water on it etc.


I was about to suggest something similar: wait for a dry day and take a
hose up there. Working from the least likely to the most likely culprit
areas, pour loads of water from an un-nozzeled hose with an observer
inside to look for any evidence.

If that doesn't yield anything (it might not) - OP could be looking at a
combination of wind and rain blowing the water back under something, in
which case repeat the excercise with a spray gun on the hose.

--
Tim Watts

Hung parliament? Rather have a hanged parliament.