As we all know, Bills Mother lives in Sneinton (a suburb of Nottingham.
One day when my daughter was approx 4 years old she suddely came out with "Bills Mothers Black" took us awhile to work out what she meant. She had heard her grandad use the saying and slightly distorted it as children do.
laurie 53 substitute dry for cold is the one I know.
Also "Tight as a Ducks A**e" (not from personal experience of course
and "can peel an orange in his pocket"
2 sayings with same meaning.
Another one, which may come under loosely under this thread, is people asking "are you cold?" if I have a jumper on on a warm day. My answer is always "No" to which they reply "well, why are you wearing a jumper then?", to which the obvious reply is "because without one I would be cold". This happens to me quite often from all sorts of Folk. I find it very peculiar for some reason.