Unfortunatley the Lotus M250 never actually reached production.
It was concieved as a model to fit in the Lotus lineup between
the Elise and Esprit. The proposed powerplant for the M250,
and presumably the source of the '250' element of the name,
was a 250 horsepower, 3.0 litre, mid-mounted V6.
The original idea for the M250 was to give the car 'creature
comforts' such as air-conditioning, central locking and electric
windows - which Lotus usually omit from their products in order
to lower weight.
As it turned out the M250 project was shelved when Lotus decided
that the car was not fit for the world market. Fortunatley the
spirit of the M250 still lives on in vehicles like the Lotus
Exige and later, the Europa.
Although the Europa was far less attractive than the M250.