UPDATED: Ivory Castle Arrow covers

I've looked before at Ivory Castle Arrow (here) with their covers by John Ryan (issues 1-9) and John M Burns (issues 10-11). I've continued to search for covers and a new image has come to hand...issue 8 has now been added to the gallery...I've also added a few more issue details about it.

The search for issue 1 and 4 continues.

Ivory Castle Arrow, issue 1

cover not to hand - can you help? 

Ivory Castle Arrow, issue 2

Ivory Castle Arrow, issue 3

Ivory Castle Arrow, issue 4

cover not to hand - can you help? 

Ivory Castle Arrow, issue 5

Ivory Castle Arrow, issue 6

Ivory Castle Arrow, issue 7

Ivory Castle Arrow, issue 8

Interior art is by Philip Mendoza, Reg Parlett and an artist who's signed his work - How they found Maroobi - but I don't recognise the signature

Here's a close-up of that signature...

Any ideas? If so, just let me know, cheers!

UPDATE: I have now been told that the artist is Leslie Caswell - who was a mentor of sorts to Mike Noble when Noble was starting out in comic strips. Norman Boyd has a number of posts about Caswell on his Visual Rants blog, including this one which has comments from two of his children: https://standby4action.wordpress.com/2011/09/17/home-notes-leslie-caswell/

Ivory Castle Arrow, issue 9

Ivory Castle Arrow, issue 10

Ivory Castle Arrow, issue 11

There was also a badge for the Ivory castle league - defend your ivory castles - it commands!