MAN spotting question

Thought I might give MAN another go on Monday and try a differrent spot to my first visit.
Looking on ringwayreports website for spotting on 06L/06R it says:

“…..Continue along the path and go under the tunnel on the far side. Turn left up a steep hill, then right through a gate, across the field, through the next gate bear left, then right. Down this footpath you will see the lights at the end of Runway 24R. From here nose on shots of aircraft departing Runway 24R can be taken as well as shots of aircraft about touching down on Runway 06L.”

Can anyone clarify where the tunnel is it mentions? Is it the tunnel that takes the river under the runway or another one?
Is this an easy route to find and observe from?

Oh, and if I get there around 8am will there still be a space to park by the Holiday Inn?!

Thanks
Andrew