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). The search for issue 1 and 4 continues. 

Previously I've added images of the club badge but for this update I've added in some images supplied by friend of the blog Keith Chapman concerning his work on 'Arrow. Enjoy!

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: 

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!

Friend of the blog Keith Chapman has shared these images of his work on issue 11. He also worked on other issues too.