As they said - warranty has absorlutely nothing to do with MOT, luckily your warranty is only for 3 years cos if it was 5, and you waited 5 years to get an MOT, you'd be pretty buggered. However 05 plates are from march 2005 - end aug 2005 i think, so you won't be late for it (unless you bought on 1st march), just get it booked and done before its 3 year old.
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I hate BMW's
*I AM THE STIG*