Hi,
Thanks for the welcome & the advice guys, it's greatly appreciated.
Following your suggestions we got her booked into the vets to make sure there was no medical issue going on and thankfully she is indeed all clear.
From what was mentioned about her thinking it's a legitimate place to go I think that may indeed be her issue, she only ever goes on carpet during the indoor incidents despite there being a tiled area, a wooden area and a kind of rough matted area nearby - always right in the middle of the deep pile carpet. So yeah, i guess she just sees that it's fine to go there, probably as a result of us maybe handling it wrong the first time she did it or it being the closest texture to grass.
Anyway, we have started to feed her a little earlier and put her out in the outside space right after afterwards so she has taken to pooping out there. Then when she gets her walk later in the evening she has been going again outdoors before she goes to sleep. We've also blocked off her ability to get to the hallway in the night so she can't get near the carpeted areas and is confined to wooden bits of foor where she seems to know it's not ok to go.
So far so good, no repeat incidents of morning presents since last Monday night..... Woohoo!
Only downside of her being outside in the evenings is she has a bit of an obcession for possums so will sit staring up at them roaming the tree above the patio for ages completely transfixed. She also very briefly started barking at them but this behaviour was well and trully stopped by a glass of water being thrown at her the second she barked. 2 barks followed by cold wet surprises were all it took to get her to stop that one so she's not daft..
Thanks again for the help guys, I'll keep on reading this great resource.
Cheers
Al