Morning Ian, I would say you won't even know you have crossed the border to Portugal but actually you will because the roads are so bad, warn Helga.
If you are keeping off the motorway you will use the N125, come off A22/E1 at J17 and if you need gas still there is one on the N125 at Aldeia Nova take left instead of right when the R125 meets the N125.
Martin
Cheers Martin!! Again. Lol.