Just for info.
Coming back from a run a couple of days ago I noticed the oil light coming on at tickover.
Checked the oil level. It was low (but still on the glass) so topped it up, but oil light still coming on at tickover.
Checked oil pressure switch to find a trace of oil on it.
Replaced next day, problem solved!!! (£8 from local MBW dealer)
Coming back from a run a couple of days ago I noticed the oil light coming on at tickover.
Checked the oil level. It was low (but still on the glass) so topped it up, but oil light still coming on at tickover.
Checked oil pressure switch to find a trace of oil on it.
Replaced next day, problem solved!!! (£8 from local MBW dealer)