Hi All,
Update on this.
I took it Jaguar just to hear out their comments. I told them my car locks with the key but doesn’t open again. They were baffled and wanted to see it. One of the senior mechanics came out as he was intrigued and said he'd never seen this before and after looking around the car for about 5 minutes he found what the issue was.
He identified that the front door latch was sticking. Every time he pressed the unlock button on the key, the drive side door tries to open, but fails. When you sit in the car and physically open and close the door latch, all the doors lock and unlock, but not on its own. I ended up buying the latch from Jaguar (but at a trader’s price £109 inc VAT, part JJDE3871) and got it fitted by my local garage. All is working perfectly now.
Thanks all for your help and input on the issue