Had my local Volvo Roadside Technician out to check the car today. Good guy but was his first P2. Jacked up the offending corner and checked for anything loose or knocking. Nothing found. Took him for a 15 mins test drive and guess what. Shock horror. The damned thing didn’t make a sound, despite clonking loudly during short trips just before and just after. Only option now is for me to try to book into Volvo in Warrington for a thorough check of spring and damper. Great!!