Essentially it came down to the Tourances I have had all the time since I have had the bike, and perhaps trying a set of road oriented tyres, and that led me down the Bridgestone BT020/BT021 route.
A bit of checking round favoured FWR Tyres in Kennington as best for the ride-in/ride-out price over Watling at Catford. As I was going up to London on Saturday anyway for an Arsenal game, I set off a bit earlier and called in. Luckily I arrived during a spell of quiet and was almost straight in. Luckier than the guys that arrived sometime after me and got told they might have a two hours wait.
Anyway, the combination of BT020 front (110/80ZR19) and BT021 rear (150/70ZR17) look good and first impression as favourable.
With new tyres there is always that "shock" that the bike handles differently, more "immediately" than on the old worn tyres you have got used to.
These went on at 51261. So let's see how long they last shall we!