Bullmoose and unicrown? 80’s mystery

[BsidetheCside]

These are all the pictures I have. Anyone have any idea what it could be? Kinda got the multicolours of a Yates, the bullmoose of a diamond back, a sprung saddle and a Citroen head badge?? Bits of this, bits of that?

 

[BsidetheCside]

Apparently the downtube lettering and head tube decal is ‘champion’