It's a long shot but if you pull the outer handle out as far as poss and look behind it you will see a black clip try use a small screwdriver to pop it off the handle and if you can do that it should open from the inside.
I've had this at work a few times where the black plastic clip moves from its groves and doesn't allow the door to open inside or out.
Hope this helps
Exactly what ive just read/seen on youtube etc
Sounds like its worth a try mate
Seems it will only work though if your module is actually clicking/unlocking when you press the fob if it's making no attempt to do anything it's doubtful it will work as car is still dead locked!
Yeah I forgot to say that about the module clicking. When my sister bought her seat Ibiza I managed to get it £200 cheaper and did this for her for free
Recently replaced my passenger door module as was making a horrible noise, £35 off ebay and took just over an hour to change it
I Thought it was a relatively simple job but my door was unlocked/open etc
When the bugger is locked shut is when the tears beging by sounds of it
Only other option Carl could be to tear the inner door card off and cut through the inner door skin to expose the latch etc
Bit drastic but struggling to see any alternative if it just won't unlock
Maybe remove passenger seat too for better access