...visible module]] in use by a very large number of pages, or is [[Wikipedia:Substitution|substituted]] very frequently. Because vandalism or mistakes would affect m ...visible module]] in use by a very large number of pages, or is [[Wikipedia:Substitution|substituted]] very frequently. Because vandalism or mistakes would affect m

...ng the third series' opening sequence, "Tower Bridge". At least one sketch substitution appears to have occurred between domestic and international versions of the