Yep, I finally repaired my Gearbox in my Datto.
Thanks alot to all the guy's advice given, especially GXMAN

Just a recap,
The box was taken apart to replace the reverse gear that was damaged.
Wasnt releasing clutch fully, but once dropped out and reffited again, she works fine now,
however,
theres a slight noise whilst idling, and when I press in the clutch, the noise dissapears,
I do know that this is the releleaser bearing noise.
What I'd like to know, is that,
would this noise dissapear with time, cause this is a new release bearing thats fitted on?

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Definately a winding, humming sound.

Do you think that the cable may need adjusting a bit.

If the noise exists when the car is idling, with the clutch released, but it dissapears when the clutch is depressed, then it might be a gearbox noise.

With the gearbox in Mexican Overdrive [neutral] & the clutch untouched, the input shaft, the cluster, & all the constant mesh gears are rotating. When you depress the clutch, all the rotating parts come to a stop. This is when the noise stops.

Do we see a connection here.

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After my gearbox was redone a couple of times due to some idiots that don't know what they are doing, I took it to a gearbox place.

Since then it has a noise also when it is standing still in neutral and idling.
Mine sounds like when you have one wheel of the ground on a jack.
You spin it and keep your ear close to the wheel.
One will hear the bearing turning on the inside. This is how mine is sounding.
When I press the clutch pedal in, it slows down to no sound in a time frame of 1 second. It is not a grinding sound.

The clutch was replaced about 5 months ago with a new release bearing.
Still the same sound.
I presume it is something in my gearbox.
Does yours sound the same?

Frankly I am going to drive mine until it is shot or the thing breaks that is making that sound and then put in a reconditioned gearbox.

Thanks for the advice dude.

I think I'll adjust the cable like you said, run it a bit and see what happens after a while once all the gears settle in etc. cause I've been told that once a g\box is opened and reassembled, its prone to have some noises at first, but quitens down after a while of driving.

Mine makes no noise, foot on the clutch pedal or foot off the pedal.

Like ZU says, if it was the release bearing/bushing (throwout bearing), then it would make noise when your foot is on the pedal.