The Beatle's Bible website [visit
link] tells us:
"In the early summer of 1968, Paul McCartney telephoned
esteemed war photographer Don McCullin to ask him to spend a day photographing
The Beatles. The group was in need of new publicity images, and wanted to get
away from the recording studio temporarily.
The chosen day was 28 July 1968. The Beatles and
McCullin were joined by five others with cameras - Ronald Fitzgibbon, Stephen
Goldblatt, Tom Murray, Tony Bramwell and Mal Evans - plus Yoko Ono, McCartney's
girlfriend Francie Schwartz, and Gary Evans, Mal's six-year-old
son.
There were seven key locations around London in what
became known as the Mad Day Out."
The same website [visit
link] also tells us about location 5:
"After striking numerous poses on a traffic island in
Old Street, north London, The Beatles travelled to St Pancras Old Church and
Gardens near Regent's Park, where some of the best-known photographs of the Mad
Day Out were taken.
Firstly, photographer Don McCullin snapped the group as
they stood on a small grass knoll to the left of the entrance steps and gates. A
nearby flower bed was arranged in a circular array saying "1869 to 1968
NDFS".
The second location was a bench to the north of the
knoll, just south of the central monument marked on the map below. Mal Evans'
son Gary sat on the bench next to John Lennon and Ringo Starr, while Paul
McCartney and George Harrison stood behind.
A little further along the path, south east of the
monument, was a drinking fountain. The Beatles were photographed here spitting
water at the camera lenses.
The fourth location was next to the mausoleum of
architect Sir John Soane (1753–1837), which was situated at the eastern part of
the gardens. They sat on the grass by the tomb, next to a sign stating: "Please
keep off the grass".
North of Sir John's grave was St Pancras Coroner's
Court, where they accompanied an elderly man reading a newspaper on a bench.
Harrison and Starr sat next to him, and Lennon and McCartney stood behind, but
the man appeared oblivious to The Beatles and the photographers capturing the
moment.
Location six in the gardens was in a flowerbed north of
the monument, situated against the perimeter railings. The Beatles stood with St
Pancras Hospital in the background, and were largely camouflaged by the towering
hollyhocks.
They then walked to a bench immediately to the north of
the monument, directly opposite the bench in location two.
The eighth location was in the church's imposing arched
doorway, where formal portrait shots were taken. While this took place, a crowd
of people stood and stared from behind the railings which separated the church
from the gardens. Photographer Don McCullin directed The Beatles to mingle with
the crowd, resulting in an image which was used in 1973 for the gatefold sleeve
of the 1962-1966 (Red Album) and 1967-1970 (Blue Album)
compilations."
A photo of The Beatles at the fountain can be seen here.