LETTS verbal reasoning ISBN 9781844192489 (Giraffe on the front) Pack 11A-D is the same as GL Verbal reasoning ISBN 978-0708719879 pack 1 tests 1-4?
No, they are not - they are completely different papers.
When GL and Letts parted company Letts retained the rights to the animal covers and GL got the papers!
So is GL verbal reasoning ISBN 978-0708720493 pack 2 tests 5-8 a different pack? And is it worth getting?
Yes, because they are 80 questions (pack one is 85) and they contain the additional 6 question types known as HIKNOS.
My DS is working through Bonds, CGS, IPS but I feel the Letts/GL are more difficult in comparison but it is the NFER (now GL) who are setting the exams
If it is a GL VR paper then Bond are not relevant. I haven't seen the CGP books, but I believe they are also not directly comparable with GL types.