Hi there everyone!
Not been around for a while, the 93 convertable has been running like a Swiss watch

(touch wood).
Problem has started with the torrential rain recently.
There is a leak, but not a drip-drip type leak. The car remains dry until I drive off (when parked over night), then water that has accumulated in the roof pours out drenching the passenger

The rest of the time everything remains snug and dry, I've driven through some awful weather with no signs of a leak, this only happens if the car has been parked for several hours in heavy rain.
I was wondering are there some drainage channels which may have become blocked?
Thanks for any advice.