Question Author
Mikey. "Did he knock on your door."
I don't know, I'm deaf and only make a point of listening out if I am expecting something. I wasn't expecting the delivery, as they didn't contact me.
"Why didn't you notice him?
Because the part of the garden where the oil tank is, cannot be seen from the house.
I'll not bother to contact the company, as the replies on here suggest it would be futile, and of course I know he meant no harm.
To those that understood my uneasiness about this, thank you.
To those that didn't, then I guess you don't mind having strangers forcing their way on to your property (to me, a locked gate says "stay out" not "come in"), and I assume you don't value your privacy as highly as I do.