I know what you mean CPC464, I asked the very same myself about a year ago. It seems none of these "crackers" took the time to do a proper crack and released a shitty version that is unplayable.
Anyway, if a WHDLoad version exists, I presume it would be fully playable, so you might want to hunt one down
[just checked: there's no WHDLoad version of this game. Shame!]
Same goes with Jetstrike, there is no properly ECS version. They have nailed the first copyprotection check, but after you play 10 levels or so, the code is asked again and this part is not cracked!
. I dont remember all the versions I got but they were mostly unknown crack teams.