The Mégane Renault Sport uses double-axis strut suspension with independent steering axis at the front which is awesome yet complex. The lower swivel bearings are not particularly well sealed to the elements (ideal for the UK!) so they tend to suffer – grease gets washed away – corrosion off salt in winter. Renault uk knew about this from what i have read but took no action – £250 for a full new hub!
Guide for replacement : https://turborenault.co.uk/t38970/
This listing is for a single bearing ONLY