I have to thank Ilke for finding these four images which
predate my first Captain Britain work.

Marvel UK's primary function was to reprint US comic books
in a British style comic. This meant a 22 page book was
broken down into instalments of anywhere between 2-10
pages. There were many problems inherent to this
cannibalistic process but most obviously, not enough title
pages.
The page borders were used to
convert the first page of any
instalment into a title page by slightly
reducing the page to fit into the
frame.

As you can see from the Thor page
below.