How long after the expiry date can I use Chipits Skor toffee bits
This is likely a "best by" date, rather than some sort of indication of spoilage.  Usually these dates indicate when the flavor and/or texture is likely to begin to degrade.  Therefore, it is not a health or safety issue, but rather a quality issue.  You can eat them, and determine for yourself whether or not the flavor and/or texture has degraded from the same product consumed before the "best by" or "expiry" date.