I have approximately 30 litres of Shell diesel drained from my wife's car (a petrol engined car.....can you see the problem there!?)
It has a very small amount of petrol in it, less than 5 percent by my estimates. won't be an issue at these levels and if used to top up an already 3/4 full tank it will be even less of an issue.
alternatively if you have a old farm land rover or diesel quad, generator etc it will work just as well.
Free to whoever wants it.
located in Edinburgh EH10
no postage sorry......