I recently lost almost all power at about 60 mph, on a very busy dual carriageway, and just limped to safety at 10 mph, after a real struggle to a lay-by half a mile away. the RAC identified and replaced a failed injector ((at a cost of £500!).  This was a very frightening experience a repeat of  which I am anxious to avoid. My question is how much faith can I have in the three remaking injectors? My total mileage to date is 85000, car is ten years old, and I am very strict about regular,professional,  servicing etc. Thanks.

It would help if we knew what engine was fitted to your car.

Usually debris(change the fuel filter if not been changed accordingly) or the O ring seal has worn. Generally speaking your adviced to replace them all.

Thanks for the tip about the fuel filter. It may have because the car had been standing for some time due to lockdown, although I was able to give it a 15 minute warm-up every week or so in the interim.

Fuel filter last changed at 50,000 miles... Mileage to date C 85,000  Engine type/size 1.6 TCRDI... Arranging for fulls rice now, and getting quote for update on injectors.