hum, i don't think britain and portugal were ever too close (even as england and portugal)
portugal was allied to spain which was most of the time an enemy for england
portugal was a catholic country while england/britain was protestant (anglican...)
they were rivals for the sea domination and for the colonies...
Faith had nothing to do with it Ilyala,nor their rivalry in other fields.It's an absolute fact that Britain and Portugal are the oldest trade partners in Europe.It was port wine that connected them,very much so.In the northern Portugese city of Oporto,or Porto,there's still every prove of that,and very tasty proves at that.
Names as Taylor,Fladgate&Yeatman,Crofts,Cockburn etc etc are not quite portugese.Croft is there since 1678 fe,I add some links.
The caves in Porto are world reknown for it's port tasting,just make sure you sip only,as all caves are in a row and you go from one to the other,a fascinating experience,I can tell.If you wish to see the whole process in all of 'm,just sip,or you end up walking backwards.
I start with the best House of all,Taylors
http://www.taylor.pthttp://www.croftport.comhttp://www.grahams-port.comFurthermore,the people in the north of Portugal,have more of a Celtic background then their more southern and south compatriots,so it wasn't just the port wine....