A group of Italian Parma ham producers are expected to learn whether they can sue the supermarket chain, Asda, at the European Court of Justice.
The producers are angry that the company packs the meat in the UK, contravening Italian law which says that it must be packed within the Parma region.
The ham's trade association, the Consorzio del Prosciutto di
Parma, wants to stop Asda slicing and packaging the ham in
Wiltshire.
But the supermarket chain insists its methods are legal, and save its shoppers up to 61% on Italy's finest ham.
The Consorzio is seeking an injunction enforcing the Italian rules which say all
Parma ham must be prepared for sale in its home region in north-east Italy.
Its claims were rejected by a High Court judge, in January, and Asda continued
to sell the ham but the Italians were given leave to appeal.
Appeal court judges now have to decide whether Asda can continue importing
the meat from Parma-based producer, Fiorricci, itself a member of the
Consorzio, and process it at a Chippenham plant.
The judges also have the option of referring the decision to the European
Courts, as the Consorzio have requested.
Facts at a glance
The so-called "Parma drama" is just one in a series of legal wrangles
involving food sold under the name of an area or region which specialises in
producing it.
European laws protect the names of certain famous products such as
Champagne, a title that can only refer to sparkling wine from the renowned
French province.
But others, such as Cheddar cheese, have become so widely used the EU says
it cannot stop producers across the globe using them.
However, while any cheese can carry the name of the Somerset village the
words West Country Farmhouse Cheddar are restricted under the EU's Protected
Designation of Origin regulations.
The same rules have prevented British producers such as Yorkshire farmer
Judy Bell from selling "Feta" cheese. EU regulation 2081/92 says the term can
only be applied to sheep or goats' milk churned in Greece.
An appeal against the ruling should be settled later this month but
meanwhile Mrs Bell has also been stopped from calling her product Yorkshire
Fetta or Pheta in a bid to escape the ban.
Stilton, Swaledale and Single Gloucester are also protected by the eclectic
EU list - but Double Gloucester is not included.
Brewers are prevented from cashing in on the names of traditional regional
brews such as Newcastle Brown Ale, Kentish Ale and Rutland Bitter.
But wrangling over contents of the list continues and British officials
recently saw off a French bid to end restrictions on the use of the words
Cornish clotted cream.
The Ministry of Agriculture, Fisheries and Food are so concerned about the
issue they will host a conference in the new year to encourage regional
producers to band together and win protection for their products.