Oil Leak

At the Castle Bytham Fair I noticed I had dumped a VERY appreciable dump of oil on the road, much more than I have ever seen.    Initial thought was the sump really leaking again (I have always had a small leak but not major), but then I managed to convince myself that the problem was caused by me parking downhill and at an angle.   The sump guard I have fitted is larger than the sump and does act a bit like a drip tray and catches the oil.   So I decided that because of the angle it had simply emptied from the front left corner.
 
So woke up this morning, first thing was check the oil.   

No change on the dipstick and the towel under the car had nothing on it (the sump is near the bottom of the towel.  So obviously I was right and it is now filling the 'drip tray' again.    Sigh of relief.