1d) Cornwall ditch, if windy, creates cooling effect. (4-5,6)
4d) Suspect 11's (11=EMU) in no pain after surgery for illness (9)
6d) RAF gala moved into new quarters in London area (9,6)
7d) Exhausted? Employ NI party (4,2)
18d) Warn posh gent carrying very little money (3,3)
Sorry I have no letters. All help much appreciated.