Where Can I Find the Master Minimum Equipment List for the A320 Series (UK / EUR)?
The latest revision of the MMEL for the A320 family was approved a month ago by EASA. The EASA website only contains a PDF document with the MMEL approval signature for Airbus aircraft.  For some manufacturers (e.g. Cessna) the full MMEL is included on the EASA website. 

The information page on MMELs says:


  Each MMEL document is the property of the (S)TC holder, and only made
  available here in full if requested by the (S)TC holder. If a full
  copy is not available here then please contact the (S)TC Holder to get
  a copy of the document in question.


So you have to contact Airbus in this case.