Two amazing trumpets

These cactus flowers are stunning. I picked the cactus up along with two great aloes last year. They were left for free on the footpath with many other succulents and cacti.
With my two kids in tow and very little room left in my garden I was happy to leave the dozen or more plants behind that I couldn’t carry. The next day most of the cacti and succulents were gone, but a few new ones had been put out.

Do you know the name of this cactus?

If I ever own a slice of country I will set up a cacti garden alongside a bee hive. I want to taste cacti flower honey before I die.