Can anyone point me in the right direction in the engine of the A/C drain?

If anyone ever has that water rushing sound under the dash its this! - the link below is useful but isnt on a MINI

Water In Your Dash? Try Cleaning The AC Drain - YouTube

Any ideas? help! :) thanks

I have a mobile air con unit at home in my room -as it gets so hot in here - and it went warm once - I drained out the a/c drain and it was cold again - maybe I could try this on my car like on that video - but im not sure how to locate the drain on a MINI


Please does anyone know where the a/c drain is on the MINI????????