I've been on insulin for 40 years. Felt the hypo when i was at nearing 75 mg/dl in the early years. (Sorry, I don't know the equivalent used in the UK). But over time, you become insulin resistant & therefore experience less or no symptoms. Now, for the most part, I feel no symptoms, even if it drops to 40 mg/dl! My greatest fear is slipping into a coma overnight. Luckily, I have health insurance so I now use Dexcom CGM. You set the high & low alerts & it blares an alarm at you whenever you drop below your threshold (or rise above it). This is a life saver! Not only that, I refer to it constantly. Probably 50+ times a day. This way, if I see my BG creep up, I can micro-bolus a correction, or if it gets too low, I can correct by micro-carbing using fast acting carbs (juice boxes are the best for this!) My A1C dropped from 7.8 to 5.7 in less than 2 months using this system. (It's described at length-and more- in Dr. Stephen Ponder's book, Sugar Surfing. I'm spreading the word so everyone can benefit this way. Good luck! Check out the free chapter online. It sure sounds like I'm a sales rep for this book, but I promise you, I'm not. After 40 years of T1D, I thought I knew it all, & heard it all - until I got his book. And thank God for that!