New member, so I'm only allowed five posts a day at present, and I've wasted a couple on showing my cats...

Yes, they're Kojaks, but I've had nothing but good experiences with them - for Moultons with 17in wheels they're pretty much the only option, and I commute into central London from Hertfordshire three times a week on mine (90 miles a week). My usual route normally has broken glass etc. on the way through the suburbs, but I've rarely had a puncture in four years or so of doing it (I think maybe three in total?), and my last pair have lasted around 3,000 miles. Considering they're slicks, the grip is also very assured on most surfaces - I just make sure I don't go over smooth manhole covers in the wet!

Your bike might be to blame for back issues - the saddle is adjustable enough, but the bars aren't that moveable, so it might be worth changing them to give you more possibilities?