Getting a new set of tyres fitted on the CBF1000 tomorrow.
Settling for Bridgestone 023's, fiited at Feltham Tyres by Heathrow.
Cost fitted is £253.00.
For the record, the original BT57's lasted a shade under 10000 miles with no problems.
The replacement BT021's have done just over 10000 miles again no problems. Still a little bit of live left in them, but have started to square off a bit
as my journey to work is now longer and straighter.

PS I've been using Puncture Safe / Ultraseal for years with no problems and I'll be putting it in the new tyres as soon as I get the bike home.