I am keen to do the Arles Camino from Toulouse to Pau or the Portuguese from Tui to Santiago -would I qualify for my certificate on these routes?
From Toulouse-Pau wouldn't qualify. In addition, even Miam Miam Dodo recommends taking the train for about 18km from Toulouse in order to avoid a day's walk through industrial areas. After that a relatively short distance is fine, but then one encounters a multiplicity of arrows going in many directions. Inevitable result: one gets lost. In my case I gave up and walked the main road until encountering signs for an historic pilgrim route and followed them without difficulty. On arriving at my destination two French pilgrims shook my hand for having made it. They too had got thoroughly lost.
Otherwise it's wonderful walking through to Pau.
I'd go for Tui to Santiago.
Bernice