BBC broadcast ran 105 mins PAL (109 mins NTSC) So not much room for 7mins of extra footage.
I think I might have a copy of the BBC broadcast somewhere in my collection.

https://genome.ch.bbc.co.uk/schedules/service_bbc_one_london/1988-12-24#at-17.45

As for the Japanese LD some times they have the theatrical trailer added on the end.
Also the LD will have burned in subtitles.

WAIT A SEC!

The US LD IS 104 mins
https://www.lddb.com/laserdisc/09571/I5054/Santa-Claus:-The-Movie

The bluray is 108:19 mins
http://www.dvdcompare.net/comparisons/film.php?fid=15294

so there you have it… 2 different versions of the film.
US cut 104 mins
International cut 108 mins