Hi Neil,

Are you absolutly sure the rear door was not ajar?

I had this happen once in that last five years and 93K miles (V plate
156), and a rear passenger had not closed the rear n/s door correctly
(although it was close, as it locked). The rain was coming down in a
horiontal fashion and I thought nothing more of it, and it never did it
again.

Just traded in for a GT a few weeks ago, wondering how well the
pillarless door seals will be performing in 5 years on that ;-)

Also, you got a s/roof? checked the roof liner for marks? as there is a
drain to the rear corners of the s/roof that run to the back of the car,
could be leaking inside the pillar or something.

A word of warning on the a-pillar trim, there is a very strong cable tie
type fixing on top of a very week plastic tower that's quite easy to
break if you try to remove it, say fitting a CD player lead or
something... so unless you are sure its wet behind I would try to avoid
removing it.

Paul

Did you get anywhere with this one Neil. I've got the same..but only
if the car is parked at a certain angle and in very heavy rain. I
suspect the sunroof. I've not investigated further just yet though.