Not off the end of the runway that bothers me bushbolox, it's off the side in a stonking crosswind!
I think JAR ops allows wet on a grooved runway to be considered dry, but only if your ops manual states so.
As for the wet question ie no eq depth would you want to land on a runway covered in oil! The contaminant is always a concern. I know I am taking it to the extreme but crews should never be in any doubt about perf or you will get slaughtered in the subsequent board of enquiry.
Manchester no prob but Aberdeen is a little more restrictive.
D and F
