FirstG

Hi to all who read this,
Firstly for clarity, the rear hubs on front wheel drives don't have the big 19mm hex bolt as there is no drive shaft.
To report back on the problem, I've just finished swapping out my N/S rear hub assembly & ABS sensor. Access was good, the spline head bolts after cleaning were relatively easy to remove & the whole job was fairly simple. Surprisingly there was alot of aluminium corrosion between the aluminium hub carrier & old steel hub but with a small amount of hammering from behind it dropped off. A drill attached wire brush made light work of it. A light smearing of ceramic grease & the new hub popped back in easily. The sensor bore hole needed extra sanding to clean the corrosion but all in all a simple job really. 
Just like all the comments made by many it did cure the 3 issues that caused my dash to light up like a Christmas tree.
Traction Control light - gone
Headlight beam adjustment light - gone
EPB issue light - gone
EPB now works as it should