Tannus Armour Tyre Inserts

In November last year either the front or rear tyre on my bike got a puncture on just about every ride. The tyres (Schwalbe Evolution Marathon Supremes 700 x 40mm) were fairly new. Lots of rain, shards of Kentish flint, thorns and broken glass all conspired against me getting home without having to stop at least once to patch a tube and fit the spare. I was getting a bit fed up with it.