Repeated Punctures

I have been running on the original Giant tyres supplied with my bike 2 years ago and have had one pinch flat in that time. I ride year round on crap covered Buckinghamshire roads, thorns from hedge flailing the lot. A guy out with me on my Wednesday ride had 3, 2 caused by the same pothole, front and back, Sometimes that's how it goes. There, that has tempted fate.

Feel round the inside of the tyre with your finger tips. You will feel even the slightest thorn, wirebrush bristle or stone like that. Also I don't regard inner tubes as throw away items. It is quicker to repair it on the road and you don't have to remove a wheel to do it.
You occasionally get a run of punctures from a particular bit of road.

Schwalbe Marathon Plus for 3 season commuting & Marathon winter for well, the winter would be my personal recommendation based on experience.

I also swear by Velox rim tape. It doesn't move,spilt or do any of the nasty stuff plastic & rubber tapes do. yes it's not the lightest & can make the tyres slightly tougher to fit, but they don't need to come off.

Most of my commuting is on glass & gravel strewn NCN & shared paths. 33miles return daily so I need something reliable

Don't get me wrong, I like Duranos and run them on one of my bikes, but they aren't the best choice for daily commuting in winter. My hack bike is fitted with Durano Plus tyres, a different beast altogether. They are much, much more puncture resistant and seem to last forever.

There is a trade-off of course, they are heavier and a little slower but if it's peace of mind you seek ........

Not sure if I missed it in the thread but are your punctures occurring in the same place - which would be a bit of a clue. Like a previous poster, I had a rim tape problem (on Mavic Elites). There was tape applied over a manufactured hole in the rim but it had very sharp edges and was eventually cutting the tube; didn't pick it up 'til 4 punctures later, over several months. I changed the tape and all was fine.

It depends how much riding you're doing, I suppose, but 4 punctures in 5 months isn't very many, especially in winter. The two in 15 minutes - did the tube blow in the same point both times? Could be some muck inside the tire, could be the hole in the tire is now big enough to let nasties in.
Higher pressures should give you more puncture resistance, but will give you less grip on slippery winter roads. How much do you weigh, if it's not too personal a question?

Use Stan's Notubes system. I'm using it this winter. You'd think I have not had a puncture at all when riding with no apparent loss of pressure. However when cleaning the bike and inspecting the tyres I can see small amounts of sealant fluid seeping out in several places. I can't recommend Stan's Notubes enough.

https://www.youtube.com/watch?v=y8fRx6lUh_k&spfreload=10

I've been using Schwalbe Durano plus Etape's on my road bikes, and Marathon plus on the Cross trails. Despite putting the miles in on the roads this winter, I've had only one puncture in 5 months, that was a destroyed tyre and rim as well, due to hitting a flooded pothole. The shielded tyres don't roll quite as sweetly as the full summer slicks, but I'll take the compromise.

Go for the widest Duranos or Gatorskins (28 - 32mm) your frame can take and drop the pressure by 20-40 PSI. You'll just as fast or faster with more comfort and fewer punctures. There's no point of running any tyres at 100PSI or more on typical roads, unless you're too heavy for the given tyre width and suffer pinch flats.

I used to use Specialised tubes and hated them on dry roads would just get a puncture. Switched to Schwalbe and had one puncture in the 6 months since switching. Thats just my personal experience.

You've either got worn out tyres or have something stuck in the tyre which is causing the puncture. Fixes out on the road are difficult on occasion because you don't take enough time to check the tyre.

Take the tyre off, stick it in the bath and clean it, then check it over, inch by inch.

I had 5 punctures in four days, the cause; a piece of wire stuck in the tyre that only caused an issue after about 4 miles each time.

Have you checked your rim tape is covering the tops of all your spokes. I suffered from a rash of punctures one spring and berated the state of the roads, until I noticed that there were a couple of places where the tape had moved and the screw heads on the nipples (this post just gets more and more like a Finbar Saunders cartoon!) were exposed (fnarr! fnarr! kyak!). Anyway, a bit of jiggery pokery got the tape back in place and no more puncturs - yay!

The state of some of the stuff they're spreading on the roads as 'grit', I'm surprised it dos'n't go through car tyres. It's like riding over diamonds..
I picked a bit of 'grit' out my tyre the other day that looked like a mini ice age spearhead..

Lower your tyre pressure a little perhaps? I run @ 85-90 PSI maximum, (touch wood) I've not had a puncture since I got my road bike (~15 months) and have covered around 2500 miles. About 1500 of those miles were on the same Schwalbe Durano tyres that you have, though I did upgrade them to some Continental ones when I saw a good deal online last summer.

When you pick up a bit of glass or hawthorn the object embeds it's self deeply in the tyre and vanishes from view. When you inflate the tyre and ride on it the pressure causes the spliter/thorn to emerge again like a cats claw and cause a puncture. This will keep happening unless you look very closely for a puncture mark and then go digging for it with a small sharp knife and some needle nose modeling pliers.

Apart from that I would go cheap and heavy with Vittoria Rubino kevlar training tyres. They are fairly bullet proof for commuting use.