Just under handbrake there a button it showing on dashboard when turn key off brake light stay on

I had a similar problem with my handbrake light the problem was a faulty handbrake sensor. The brake light stays on because of a fault in the system the handbrake. I just disconnected the handbrake sensor

I am going to hope these two items are related.
First the handbrake.
On most cars, it works like this. ( Wish I could say that for VW !)
The handbrake lever or pedal has a very small switch, about the size of your little finger, located in a place near the lever or pedal so that, when you push the pedal or pull the lever, the little switch has a button inside it that is released to come out, and that turns on your light, telling you the brake is on.
It is a "push button" switch.
When you release the pedal or the brake lever to normal position, the button is pushed back into the switch turning off the light.
I suspect you have a lever between the seats.
It will be surely hard to find the switch, as it likely is down inside the console.
If yours has the pedal under the dashboard, it is much easier to find, as you should be able to see it way up under the dashboard near the top of the emergency brake pedal.
The switches are usually only a few dollars, unless you go to a car dealer, and the labor can be high.
Oh yes, sometimes the switches are made of cheap plastic, and they can actually break or fall out of their socket !
I think the beeping may just be an audible reminder of the switch problem.
Be Blessed.

Everything is check the light stays on can it be the switch on the handbrake lever

check the brake fluid reservoir that also causes the light to come on aswell if low fluid or stuck float in reservoir

Handbrake light switch may be damaged. It is just beneath the handbrake

That sounds like it could be the handbrake warning light.Check the switch under the handbrake lever,if not brocken.Also could be the brake fluid level sensor,telling you the brake fliud in the bottle is low.good luck

Check the switch under the handbrake lever, it may be out of alignment or broken or it may have a wire shorting out which is causing the dash light to stay on.

could be something as simple as the E-brake or handbrake is not in its proper position, check it by pushing the button and moving handle down. if this doesn't work you may have a bad switch.

it could also signify that you have low brake fluid as well as other things that I cannot think of at the moment,

good luck

i have vauxhall vivaro van got starting problems could be glow plugs but now i have a flashing stop light on what looks like a picture of a engine

From the manual: First find the reset button, located below the handbrake (emergency brake) lever. The button has an "exclamation mark in a tyre" symbol.

Make sure the pressures in all tyres are what you want them to be. 35psi all 'round is good for sporty driving.

Engine off. Turn ignition to the second position (ON) but don't start the engine.

Keep the re-set button pressed until the flat tyre indicator light on the dashboard COMES ON for several seconds.

Start the engine, and drive the car normally for several minutes. This will re-set the indicator to whatever pressures you have in the tyres. Hope this helps!!