UPDATED: The real Ghostbusters - collected comics

I'm not a collector of Marvel UK's ' The Real Ghostbusters ' comic but I've seen that the collected editions seem to be quite expensive so I thought I'd see if I could identify how many there are. Ideally I'd love to be able to tell you what stories they reprinted (and from which issues) and which issue of the comic the cover has come from but, sadly, I can't.  Instead if you can help me fill the gaps in the covers gallery below (#8 and #10) and confirm if the series went beyond #11 that would be very helpful! Enjoy!   UPDATE: I've now identified that there was an issue 13 - so I've added that to the gallery. The real Ghostbusters, Marvel UK - collected comics number 1 The real Ghostbusters, Marvel UK - collected comics number 2 from 1989 The real Ghostbusters, Marvel UK - collected comics number 3 from July 1990 The real Ghostbusters, Marvel UK - collected comics number 4 1991 Summer special The real Ghostbusters, Marvel UK - collected comics number 5 from February 1992 The real Ghostbusters, Marvel UK - collected comics number 6 from May 1992; the cover had been originally used on issue #90 The real Ghostbusters, Marvel UK - collected comics number 7 from December 1992 The real Ghostbusters, Marvel UK - collected comics number 8 image not to hand The real Ghostbusters, Marvel UK - collected comics number 9 Holiday special 1993 The real Ghostbusters, Marvel UK - collected comics number 10 image not to hand - can you help? The real Ghostbusters, Marvel UK - collected comics number 11 produced in 1994 The real Ghostbusters, Marvel UK - collected comics number 12 image not to hand - can you help? The real Ghostbusters, Marvel UK - collected comics number 13 image c/o  here and there was this too