Hmmm, it depends I guess. Insulin is OK at room temp for about a month, so this excursion in itself will not make the insulin bad.
If it were me, and I only had, say a months stock of insulin anyway, and the shelf life date was 2012 or beyond..i would just use it, and watch my BG...but, if teh expiry date is fast approaching, or, I had 6 months worth in there..I would throw most of it away. and keep using it for the next 6 weeks or so.
All thsi is based, on a a tiny bit of knowledge about how expiry dates, etc for maedication iscalculated and assessed, adn also, becasue I hat to cost the NHS even more than I already do. Obviously, if you notice your control going AwOL, get rid and restock.