Hey, Guess what? I did it again, only worse this time - I gormlessly put 15 quid (3 gallons) of unleaded in my Multipla tank!

and :bang:
Realised right away, so filled the tank with diesel. I was just into the reserve when I pulled into the gas station, the manual says the reserve is 7L, and the whole tank is 65L. So once completely filled I reckon I had a tank of 13.5L of unleaded to 52.5L of diesel, so almost exactly 1:4 unleaded to diesel.
I know what you're going to say now... too late... don't switch the engine on... and call the fuel drain guys.
Well the car started OK and ran OK, maybe below par, or is that my imagination?
Drove home, and then read all the horror stories about contaminating diesel with unleaded, the main horror being that diesel, being oily, lubricates the fuel pump and components, and unleaded acts as a solvent, potentially causing the pump to blow up, then swarf finding it's way into the engine and knackering that as well.
Too embarassed to have my neighbours' see the "This W**ker's Put The Wrong Fuel In His Car (Again)" fuel drain vehicle show up outside my house, I have thrown 400ml of clean engine oil mixed with some diesel into the fuel tank. And today I've thrown in a litre of (clean) vege oil mixed with a gallon of diesel to provide some lubrication - or to give it the correct name I learned Today - "Lubricity".
Drove around for about 20 miles Today, still starting OK and running. Don't know if this will last.
Found a diesel fuel additive which is designed to provide lubricity so might get some, till I'm back to 100% diesel, or the fuel pump and then engine go bang. Also found something in Halfords which reconditions the fuel system after a misfuel (presumably to use
after you've cleaned the fuel system).
If the witches brew that now resides in my fuel tank - unleaded, diesel, engine oil and rapeseed oil - works, I might try drinking some to see if it adds some years to my life!
Feel free to add humorous or other comments.
I'm crossing my fingers and avoiding black cats.