Accord 7th Gen roof leak in snow

[DenF22]

Hi all,

Last year, I had a bad leak in my 7th Gen Accord Sport GT. (saloon, No sunroof)
It turned out to be cracked body sealant, located under the roof trim, which I resealed and the leaks stopped.

We had our first snow fall last night and now (when driving) I have some water dripping down from sunvisor arm, drivers side.
The windscreen rubbers look fine, has anyone else had a similar problem and found out where the leak originates?

The previous leak ran water down the driver side (right side UK) windscreen pillar and soaked the floor, but this is still dry and I have a new leak..doh!
The car was fine in rain, but melting snow seems to be finding a path somewhere.

Help in locating the likely spot would be gratefully received

 

[DenF22]

Further to my last, a good poke about around the inside of the windscreen under the headlining, has revealed gaps in the urethane.
The job is surprisingly uneven, with large splodges beyond the interface in some areas and voids in others.

Has to be coming in through a small crack around here somewhere.
In better conditions I'll try soapy water and an air hose.

Thanks for reading anyway.
If someone else has similar issues, I'll repost here after I've solved the problem.