Should repainted double yellow lines be placed exactly over the original ones?

Should repainted double yellow lines be placed exactly over the original ones? Ours have moved forward and now run over the painted "keep clear" writing on the road.

Can I park on white lines outside my house?

I recently moved into a property where my next door neighbour has a white line outside his house. That’s fine, but the problem I have is that his white line extends 4ft over my frontage making it hard...