Was in a garage having a MOT once and mechanic had a Renault Scenic up on ramp changing steering rack - Next time I saw him asked if it stopped the knocking - No - turned out to be lose sub frame bolts - Did you put the old rack back on ????-They diagnosed it -- guess the answer ?
Another job off my list - changed front drop links - ordered a air filter and pollen filter - air is ok but the pollen is a pig of a job
Intresting.
Next time I'm under the car, I will check every bolt i can find.