Nearly there. Thanks for all your help .
14a by which may be a good place for 10(answer to 10 is picnic)
?t???m. Is it stream
18a Arthur Duckworths tongue(4) Is it Urdu
16a conditioning the soil or gathering the fruit under the lindens(6) l???n?
17d interfere with the holy one at the end of the jetty (6)??l?s?
Many thanks