The other day, returning to car after parking, 'Service steering lock' message comes up - steering locked & won't allow me to start. Locked, walked away, came back again. No joy. After about an hour got started, no idea how I got rid of it! after [unsuccessful] lengthy call to RAC telling me to 'turn the wheel forcefully and push start button with fob' [not convinced about that TBH, & didn't do the trick anyway] So cancelled RAC & seems fine since. What could cause this? Is it likely to recur? & will it be costly?