The general rule is a blood test 3 months following diagnosis with a medication review (if appropriate). Then it depends on how you are doing and your own GP practice. NICE says a review should happen at least 6 monthly until such time as blood sugars are stable and reasonable, and medication is also stable. After that it could be annually depending on your Practice.
If I were you I would give your surgery a ring to make sure you haven't slipped through the net.