Click and Send issues with Postcode and select a service , quick help needed :)

[jerryman12a]

Arrggg , hopefully I can get some quick help from you great guys

Trying C & S for the first time all good until

It says Postcode ( Farrell Flat 5416) is incorrect but that's the one

and also it keeps asking for "select a service" which when I click it sends me back to " incorrect postcode"

Before I give up and re-wrap the parcel :_|  any ideas what I should do to make AP like what I entered ? :^O