Thanks to media coverage (namely in the Mail on Sunday), Thames Valley Police have had a re-think, and are now once again providing escorts once the hearses cross the county line into Oxon.
For the time being they're using marked police cars, as all their motorbikes are out of action. Once new fleet of bikes is delivered in June, they'll be back to bikes.
No harm signing the petition, but it looks like the objective has been achieved - provided TVPolice stick to their word...