Checks have been carried out by police on rural roads in Staffordshire a week after billionaire businessman John Caudwell's home was robbed.
Mr Caudwell suffered a head injury during the Broughton Hall raid and said it was only by the "grace of God" he was still alive.
Police carried out the checks to try to find potential witnesses who had been in the area the previous week.
A spokesman said several lines of inquiry were being followed up.
More than 50 vehicles were stopped around the area of Broughton Hall and Loggerheads, near Eccleshall, on Monday evening.
Mr Caudwell, the former head of Phones4U, was cut on his forehead and elbow when a group of men broke into his Staffordshire home on 1 November.
A 48-year-old man from Liverpool has been arrested on suspicion of aggravated burglary and released on bail.