Your string result is already in JSON ;)
Just revise the end of your string, then read it and use it as you want.
[{"POSCODE":"01","POSDESC":"BAR"},
{"POSCODE":"13","POSDESC":"CAT AC"},
{"POSCODE":"02","POSDESC":"CATERING"},
{"POSCODE":"15","POSDESC":"CLUB FUNCTIONS"},
{"POSCODE":"07","POSDESC":"GYM"},
{"POSCODE":"14","POSDESC":"OTHERS"}]
If your result was in a "real" XML format, I've suggested this link to you ;)
http://stackoverflow.com/questions/18337394/convert-xml-to-json-object-in-android[
^]