private string GetOverMaxSizeMessage()
{
var maxDimensions = pricingService.GetMaxDimensions();
// Print in length, breadth, height order of size for conistency with question.
return($"Parcels larger than {maxDimensions.MidDimension}mm x {maxDimensions.LongDimension}mm x " +
$"{maxDimensions.ShortDimension}mm cannot be shipped.");
}