Kong was a direct rip off of Donkey Kong for the ZX Spectrum that was created since the NES was nowhere near as popular in the UK as the US. The end result however is nowhere as near as good as a game as the original.
The game does have the exact same level layout, character names and goals as the original except for a few minor differences like In this version Mario is a carpenter. The game play however is quite broken in places with inaccurate hit detection where barrels could kill you after you jump over them, ladders that you can climb that are not actually drawn on the screen, elevators on the second level you could ride off of the top of the screen to beat the level and a bonus score that if you let reach 0 actually awarded you over 60000 points.
This game would be later followed up by a sequel, Kong Strikes Back! which was a clone of Mr. Do!'s Wild Ride. Oddly, a few month's after KSB was published, Ocean Software Ltd. would actually acquire the rights to publish Donkey Kong on microcomputers.