Yes Sean, that is the original. It's different but nice all the same.
There was a 'Reggae at the BBC' show earlier this year where Dennis performed this track at the time on TOTP, I remember missing it back then and being told by friends at school how great it was
Those were pre-boombox days, we only had mono recorders powered by 'Flying Bomb' batteries, or Vidor (both cheaper than Ever Ready). Flying Bomb used to corrode like hell.
Cheers
Brownlow