As Aron stated, there’s an access hole. It’s located about 1 or 2 oClock (If memory serves me) looking at the tire. It’s up on the inside of the wheel arch, I believe it’s the only rubber plugged hole in that vicinity. Once you pop the plug out, you’ll have to root around with a screw driver type tool to get the bonnet to release.
The first time out, I popped the front tire off so I could get my head in the wheel arch and look up the hole with at torch to see what I was trying to accomplish. the goal is to take a medium sized flat bladed screw driver and stick it in between the bonnet (latch) pin and the latch. Once you’ve got the blade in the right spot, then give the screwdriver a twist to push the latch back. Sometimes the twist doesn’t work, then you’ll have to pry either towards the bulkhead, or the front of the car. Sorry, I can’t remember. It’s 12:30am right now, otherwise I’d run outside and verify it’s location.
It’s very fiddly, but once you pop the bonnet a couple of times, you get good at it. I have an XJ6 where the latch would get caught on a hot summer day, and wouldn’t release.
Let us know if you’re successful