In addition to what Finsky asked, can you tell us if you're type 1 or type 2? Can you also tell us what type of insulin(s) you're taking as well?
It sounds like you're on set doses of insulin which rarely yields good control. I'm willing to bet you were also told to eat a certain number of carbs each meal (it's called the "Sliding Scale"). There are certainly ways to improve on that (carb counting), but let's not get ahead of ourselves.
I'm in the US myself and use Levemir (long-acting/basal insulin) and Novolog (short-acting/bolus insulin; they call it "Novorapid" in the UK).