This is the third movie in a series of road trips by funny man Steve Coogan and his sidekick Rob Brydon. I still recall the second movie, "The Trip to Italy," which shares the same premise: two semi-famous British entertainers eat their way through a country while entertaining each other with scripted and improvisational banter and comedy. "The Trip to Spain" echoes the last movie except the scenes are in Spain and the language being spoken is Spanish.
It seems to me that there's a lot more involvement with people playing Coogan's and Brydon's families and love interests in this third movie and for me, this pierces the bubble of the movie's conceit. Coogan calls his married lover in New York and a camera just happens to be there to capture her end of the call? If that part isn't unscripted, then the whole movie is scripted with perhaps some improvisation. So when Coogan and Brydon entertain each other with endless facts about the towns they're visiting, they're not being erudite, they're reciting scripted lines. Some of the overlong imitations of Marlon Brando, Mick Jagger, Sean Connery, and particularly Roger Moore--those are likely to be improvisational.
In all, this is a pleasant movie and the Spanish scenery and architecture steal the show and are probably worth the price of admission alone. The bit about food and reviewing restaurants seems muted and subdued in this film compared to the last one.
The ending however, deserves to live on the cutting room floor. (Again, that's my opinion.) I'll leave it to you to decide on that one.