Hi there,seeking this 1983-84 reggae tune's name!!!

[Pharcyde]

Hi all!
There is a tune that bothers me caz I cannot find its title.
Its definitely a 1983 or 84 reggae tune,propably uk.
In the beginning I though it was Sonia Ferguson and the Wild Bunch - Let's do it again caz sounds like a cover from the Staple Singers song.
but wasn't,and now I still need to find it.
could be something from the Wild Bunch group.Maybe Wild Bunch - Dangerous but no sample around to check...
so anyone with ideas?here is the sample,
please ignore actors voices (comes from a local movie of 1984)
http://www68.zippyshare.com/v/dIaRbUB6/file.html
thanks!