So finally getting a resolution on mine.
I'm in the UK and out of warranty but took it along to my local Apple Store. They checked it over, ran some diagnostics and confirmed it was a fault and would need to be replaced at no cost. The support guy took some details then asked where it was purchased as it wasn't direct from Apple. I confirmed it was Currys. He said out of warranty must be taken up with the retailer - had I bought it direct then it would have been swapped out there and then. He did prepare a work authorisation sheet detailing the issue and also included the cost for a replacement.
I took this all to Currys and discussed. They were adamant they would need to send the iPad to their service centre for inspection and when I told them it was out of warranty, they said they would need to charge £60 for sending it off. I told them this wasn't necessary since I had been to Apple and they confirmed the defect and provided evidence of this. The Currys person then got their Manager. I explained this all to him and he said he would need to send it off. I told him this wasn't the case and that I was due a replacement. He said that is fine but they would source a replacement from Apple directly and I would need to pay for it. I then quoted Consumer Rights Act 2015 and since I gave evidence it was an inherent fault, it was up to Currys as the retailer to either repair or replace at no cost to myself otherwise I was entitled to a full refund. The manager then referred me to the Currys Customer Service helpline as it was above his authority.
I called Currys and explained it all to them. I was redirected to their Out Of Warranty team who were very helpful and set up the case there and then. They asked me to go back to the Store and quote their case id and show the Apple repair sheet and they would sort it out. Back in store, I went through it all, the woman spoke to the Out of Warranty team on the phone and confirmed Currys would organise a replacement - likely a store credit or voucher. They called me back a week later to confirm they would refund me the cost of the replacement iPad direct from Apple including VAT which would be paid directly to me and I can then go back to the Apple store and swap out for a direct replacement.
Sorry for the long post but I just wanted to ensure people in the UK in the same position are not fobbed off and get a result. If you have bought from Apple then it is a simple swap out at no cost to you. If you bought from elsewhere, you have the same entitlement, it just takes a bit longer to sort out. Key thing to quote if bought from other retailers is the Consumer Rights Act 2015 which mandates you are entitled to a repair (not possible for iPads) or replacement and if they can't provide that then a full refund. If you bought from Currys, tell the customer service person you want this referred to the Out of Warranty team to speed things along.
The first step though is to contact Apple and get them to verify the issue first as their documentation is key to forcing other retailers to provide the resolution and leaves them with no room to push back.
Hope this helps.