On a streaming wet motorway in roadworks I hit the rear of a BMW X5 in my car when the traffic stopped suddenly. The impact speed was approximately 10 mph and the damage to my car only a broken front number plate. There was no apparent damage to the X5. Both cars were driven to the next junction, details exchanged and journeys resumed. It was my fault by definition of course. Direct Line then contacted me to say they have had a claim directly from the other insurers. The other vehicle has gone to an approved repairer and Direct Line won't be enquiring why and the driver and passenger both of whom were in no difficulty after the low-speed impact and confirmed at the time, now have "back injury" claims which my insurers imply is okay with them. I believe the claims are at best exaggerated. Is there anything I can/should do?