Ozzie, your problem sounds just like mine. This I copied and pasted from my comment in April in another forum:
Dunlop SP31 on my '59' GE Jazz. Excess wear on just the inside inch front tyres suggesting toe-out. Which I thought might contribute to annoying slight steering wander on motorway at straight-ahead, too.
Honda technician measured the tracking as 'OK' as he/they had done a few thousand miles earlier, too, when I initially expressed concern.
Nevertheless at 13,000 miles I had them realigned. And 'rotated' to rear bringing evenly worn rears to front. Otherwise those front tyres (now on the rear) would have been past worn smooth on the inside edges by now.
Now at 23,000 miles (10,000 miles later) fronts are worn PERFECTLY EVENLY with 7,000 miles life remaining - at least. All 4 Dunlops look likely to do 30,000 or more. Possibly 35,000. Steering tracks better on motorway straight ahead, too... noticed immediately after front wheels alignment job.
Of course tracking is not supported by warranty and I took it to an independent tyre fitter who quoted half Honda's price for the realignment. I closely watched the whole job and he pointed out the extent of the mis-alignment. Not great but probably enough to wear the tyres on that inside edge, he said.
When I asked additionally for rotation fronts to rear did that for no extra cost.
£26.50 inc vat.