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As per title my speedo works faultless except the mfa\mfa display. It's always blank, no matter what I have tried to fix it.

So need another speedo or just working clock/mfa to swap over

My speedo is this type 👇

I'd stick with it,  it  did work  .
Have you  checked the  wiring / earth  connection  ?

I had the same issue, the lcd screen wouldn't work. 
Tried another set with another damaged lcd (it kind of half worked so I know that the car wiring is good).
Have now bought a 3rd set of clocks to strip and butcher for bits to fix mine.

Someone on my local forum is selling an lcd screnn that may be of use to you
http://www.swdubs.co.uk/forum/viewtopic.php?f=20&t=32176