Our experience and surveys, have clearly indicated that the majority of buyers are either mechanically minded or have vehicles checked by their own mechanic.  We therefore sell all our vehicles with no mechanical warranty and the purchase price is kept low. 
Of course for those that want a Mechanical Breakdown Insurance we have those available. 
We have carefully chosen the people that we work with and they are MMS Ltd based in Waltham Cross, Hertfordshire.  MMS (Mechanical Managements Services) specialize in Mechanical Breakdown Insurances for the Motor Trade.  Backed up with Green Flag cover these warranties are second to none. 

Cost start from £149 inclusive of parts and labour for a period of 3 months. There is no limit to the number of claims and the work can be carried out by your own mechanic. 3 - 6 - 12 - 24 month warranties are available for any vehicle at the appropriate additional cost.