That's interesting as I have always thought that a grooved runway was rarely declared as being WWW and that was one of the main benefits of grooving. Perhaps someone at SOU can say what the situation is there.
I've never known LCY to suffer diversions away due to being declared WWW and I would have thought that airport might be rather critical to some aircraft types in that respect.
Sorry for the thread drift and not wishing to prolong this discussion more than necessary.