I own an mw and I use the following procedure. Firstly strictly stick to the procedure set out by Richard Farrant.
if this doesn't work. .......... Give it three verbal warnings, each warning should be more obusive than the last. Should this fail shout 'right that's it' and thrash the vehicle with a branch. As recommended by basil faulty.
It may not work but it will cheer up people that are watching.