In Hoi III, Countries that were neutral in real life tended to be neutral in the game, with restrictions helping that. Portugal was one such country. But when war broke out, the Portuguese Government said that the Anglo-Portuguese Alliance remained intact, but since the British had not asked for Portuguese assistance, Portugal would remain neutral. This would seem that if the British had called for their help then Portugal would have joined the Allies. The British didn't because they feared that if they did then that would drive Spain to join the Axis. They did ask for, and received, use of navel bases however.
As Hoi IV is going for a more sandbox, less forced history approach, I think there should be a decision for the British to call upon the Alliance once war broke out. Either by requesting the use of bases, as they did historically, or even asking for full on assistance. If Portugal does accept and join the Allies, then it would increase the chance of Spain joining the Axis. This would lead to some interesting alternatives for fighting the war.
The British should at least be able to get access to bases in the Azores.
As Hoi IV is going for a more sandbox, less forced history approach, I think there should be a decision for the British to call upon the Alliance once war broke out. Either by requesting the use of bases, as they did historically, or even asking for full on assistance. If Portugal does accept and join the Allies, then it would increase the chance of Spain joining the Axis. This would lead to some interesting alternatives for fighting the war.
The British should at least be able to get access to bases in the Azores.