I have a orange warning light flasing on my mini cooper 51 plate and i do0nt no wat it is can u help?? the symbol has a (!) on it? there is a button with the exact same symbol under my handbrake

This is the tyre pressure indicator. It shows that one of the tyres is losing pressure through a calve leak or puncture, or can also be triggered after you get new tyres or rotate the tyres.

The method to re-set the tyre pressure warning light is as follows:

Turn the ignition to position 2 (ignition on but motor not started). Press and hold the button under the handbrake until the warning light on the dashboard comes on for several seconds. Start the engine. Drive the car normally for several minutes. This will cause the system to re-set to the current tyres and pressures you have. It will then only turn the warning light on if the pressures change - for example if you get a puncture.