Freelander tailgate.

Hi folks, I'm new on here so please go easy.
I have an 04 Freelander with a tailgate that won't open. It's been a bit intermittent but has finally decided not to open. The window drops when you pull the handle (and works fine from the master switch) but the lock has stopped releasing. I'm suspecting it's a faulty electrical connection as when it was working there was no mechanical problems with the operation. My main question is what is the best way to get the door open so I can get inside to the lock mechanism?
Btw the car has been very well looked after and serviced prior to my purchase a month ago and has low miles (58k) so I'm suspecting age related corrosion.
Thanks for reading.
Cheers Just

It'll be a wiring fault near the door hinge or corroded contacts on the actuator plug, or the actuator itself. If you use the search function, you'll find 1000s of answers, as tailgate questions are one of the most common.

Don't forget to do the one wheel up test on it too, and make sure all tyres are identical with the least worn on the rear. The next most common FL1 problem is the 4X4 system going bang due to incorrect tyre maintenance.