80s dance-pop song (can't be more Wham! than that)

No really.

http://www13.zippyshare.com/v/3096749/file.html

But if I consider that 99.9% of all music Wham! had ever produced is now available with full lyrics in the net, I wonder who managed to imitate Wham! here so perfectly?

If it's not a Wham! song, it's at least VERY close to it.
Does this tune ring a bell to anyone?

(apologies, IIRC the recording is from a gym, hence the excess reverberation)

Surprisingly like Wham....Not the style they're known for, but it sounds like a track by Culture Club (Boy George on vocals) sounds like him especially towards the end....pity the recording stopped when it did as next bit sounded like it might have been a chorus. Maybe an album track rather than major hit?

Yes, I think so too. BTW your hinting at Boy George was very good; though I would not have thought about him in the first place, it might as well be his voice.

Nice song, but I don't recognize it. Roxette had a similar sound, but I'm fairly familiar with their songs and I don't think it's them.
I'd recommend trying to figure out the lyrics first, and go from there. It sounds to me like some lyrics are...

"?'cause baby you and me have got somethin'"
"and make you mine"
"tomorrow mornin'"
"I wouldn't be"
"I'm so"
"and you know that I forget..."