As a general rule it is wise to have your alignment checked

every 12,000- 15,000 miles or once a year

However, it is also highly recommended when;

• You have hit a kerb or pothole
• New tyres have been fitted
• Steering and suspension components have been replaced
• The vehicle has been involved in any form of accident or collision

( If the vehicle as been to a repair centre it may have had the alignment checked – just ask for the printout )