Just looked at my own link again on the other page. The car was reported as hired in Dover - and tracked from London to Kent. So he definitely hired it in Dover, not London IMO. Which suggests to me accused maybe hired it on 2nd BEFORE going to London for the 7pm to 7am shift (left home, went to hire car place, hired the car, drove to London. Slept somewhere during the day in London then out that night in the hire car. So does sound premeditated. MOO, speculation.
Could have slept at a room at Poynders and hence why the car was already there. MOO, speculation.