Punctures

I cycle from the South East London/Kent borders to central London on average 3 days a week. I have a decent bike, made with decent components. Everything has been great and I really enjoy it. Except I've had 3 punctures in the space of 12 months. That's not normal! Yesterday morning was miserable. It was 6.30am, dark and wet and I was at the side of the road fitting a new inner tube. My conclusion is that the tyres are not up to the job, so I've changed them for a pair of Schwalbe Stelvio Plus tyres which I'm assured have very high puncture protection. We'll see! They're also slightly thinner, so I should be a few seconds faster next time.