Land Rover Series 2A Engine Noise

Can anyone help me with this engine noise. It is a clakety sound, like a machine gun which occus at the top of high revs before changing gear.

Once in gear, the engine runs fine in the mid-range for the gear and speed. When revving up before the nest gear change, I get that clackety sound. Heard  the most on top of 2nd and top of 3rd gear.

Here is a short video demonstrating the sound.

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Thanks!
Mike

Rear Seats

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Is this rod knock?

Is this rod knock?

You can hear it at the very beginning of the clip. I'm in second gear revving up to switch to third and it clatters.

Dash with funky wiper switch

What is this grey funky wiper switch in the middle? Looks to be coated in "Plasti-dip"

AND - what is that bulb in the center? It stays lit most of the time as soon as I turn on the ignition switch