Are you in spain?
I suppose not, but if you were, that'd be normal.
To get back to the english version, go to "preferences" ("Preferencias"), on the main page, then select "english" in the " Idioma de la interfaz" pulldown menu and press "guardar preferencias" at the top-right.
Thanks for the quick reply, and I can do all that, including setting inglés and saving.
However, the next call to Google takes me back to http://www.google.es/
So, what your suggestion does is to let me see an English interface on http://www.google.es/
If I close and reopen, say Firefox, I'm back to Spanish so, saved or not, something doesn't stick.
This makes no real difference to me as I'm as inept in Spanish as I am in English but I'm puzzled about why/how this happened.
I'll force it to Google.ca, that works.