CV boots are an imperative element in keeping your car up to standards. They cover the driver shaft area which connects the transmission to the wheels. CV (acronym for constant velocity) boots are a flexible rubber cover which cover the cv joints to stop grease from leaking and dirt getting in. Bad condition, or ripped CV Boots will cause your car to fail the NCT or MOT. CV boots are cheap to buy but it is a relatively time intensive job as lots of components need to be removed, so the price of fitting will be high.