From 1983: More gifts direct from the hallowed halls of MARVEL UK.
The launch of a new weekly was always a good excuse for three to four weeks of gifts (kids today don't know they were born... dozens of gifts with EVERY issue!), usually of decreasing cost to the publisher as the weeks wore on. With two new titles on the go (THE MIGHTY THOR... swiftly followed by THE X-MEN), there were even more goodies to be had.
However, Marvel obviously didn't want readers to start defecting from SPIDER-MAN (or wanted to replace any that bailed out) so they also pushed the boat out for a Spidey pin-badge.