Thanks for getting back to me FNutz:
Hardware version of DAP is A1.
Firmware version is 1.00.
Region is New Zealand.
RTA 1025W is a modem/router supplied by Telecom, one of of local ISP's - not sure how old it is but it's been around for a while.
Sorry but not sure how I can determine the mode the DAP is in? AP or Bridge.
[UPDATED: I have managed to get this working so thanks for your help:
Found the app link at http://www.dlink.com/-/media/Consumer_Products/DAP/DAP%201320/QIG/DAP1320_QIG_EU.pdf, loaded on my i-phone and set-up from there. Took a couple of minutes using that app.
Thanks again for the support.