Rear boot door won’t open

[Pancake]

Hi , I think this is a **** problem. My boot catch won’t open unless I push the boot release on the key fob and open the handle at exactly the same time. Can anyone advise exactly what I need to buy to replace and fix this. Is it the switch or the catch?
Thanks I’m advance. James

 

[Pancake]

Sorry I should have said it’s an 2008 discovery 3. Apologies. The **** word was common. It didn’t like that apparently ‍