Driving without an MOT

I live in Somerset & collect vehicles for my son who has a garage in Cornwall. The cars are collected from auction sites & driven on Trade Plates. The auction sites can be anywhere in the country, but one used is located 15 miles south of my home between Somerest & Cornwall. Am I permitted to drive such a car if it has no current MOT from the auction site to my home prior to onward journey to Cornwall or must it be driven direct to the garage site. The car would be stored off road at my home. Would the direct drive from auction site to garage site apply in all cases irrespective of where the auction site is.