Some books seen:

<Prehistoric Wales>.  Frances Lynch, Stephen Aldhouse-Green and Jeffrey L. Davies.
Phoenix Mill, Thrupp, Stroud, Gloucestershire[, UK]:  Sutton Publishing, [2000].
I.  Palaeolithic and Mesolithic Wales.
Stephen Aldhouse-Green.
Pp. 1-41.
II.  The Earlier Neolithic.
Frances Lynch.
Pp. 42-78.
III.  The Later Neolithic and Earlier Bronze Age.
Frances Lynch.
Pp. 79-138.
IV.  The Late Bronze Age and Iron Age.
Jeffrey L. Davies and Frances Lynch.
Pp. 139-219.
Biblio (220-240) is not annotated but most references are clear so OK.
Chapters are *entirely* topically organised, making chronology difficult to follow.

<Book of Iron Age Britain>.  Barry Cunliffe.
London:  B. T. Batsford Ltd/English Heritage, [1995].
"The land" (geography) pp. 11-18
"The people:  race, language and population" pp. 19-26
"The great transition:  taming the land" (1400-400 BC) pp. 27-39
"Conflicting claims:  the emergence of tribal entities" (400-100 BC) pp. 40-58
"Reformation and tribal society" (100 BC - AD 43) pp. 59-75
"Of chiefs and kings" (sociology generally) pp. 76-86
"War mad but not of evil character" pp. 87-97
"Approaching the gods" pp. 98-111
"The Iron Age achievement:  a longer perspective" (Romans didn't exist) pp. 112-118
No biblio guidance and few references.
Series:  English Heritage.

<Britain and the Celtic Iron Age>.  Simon James and Valery Rigby.
[London]:  British Museum Press for the Trustees of the British Museum, [1997].
"The making of the Celtic Iron Age" pp. 2-15
"The people" pp. 16-26
"Making a living" pp. 27-47
"Settlements and societies" pp. 48-61
"Rituals of life and death" pp. 62-73
"Change, contact and conquest" pp. 74-83
"Conclusion:  Britain and the Celtic Iron Age" pp. 84-85
No useful biblio guidance but fair # of references.

<Iron Age Communities in Britain.  An account of England, Scotland and Wales from the Seventh Century BC until the Roman Conquest>.
Barry Cunliffe.
London and New York:  Routledge, [1991].
I  Introduction
  "The development of Iron Age studies" pp. 1-20.
II Space and time
  "Space and time" pp. 21-27.
  "The background" pp. 28-59.
  "Regional groupings:  south and east" pp. 60-93.
  "Regional groupings:  north and west" pp. 94-106.
  "Protohistory to history, c. 150 BC to AD 43" pp. 107-129.
  "The tribes of the south-eastern core:  Catuvellauni/Trinovantes, Iceni, Cantii and Atrebates" pp. 130-158.
  "The tribes of the periphery:  Durotriges, Dobunni and Corieltauvi" pp. 159-179.
  "The late pre-Roman Iron Age in western and northern Britain" pp. 180-198.
  "The establishment of Roman control" pp. 199-210.
III Themes
  "Themes" pp. 211-212.
  "Settlement and settlement pattern in the south and east" pp. 213-246.
  "Settlement and settlement pattern in the west and north" pp. 247-311.
  "The development of hillforts and oppida" pp. 312-370.
  "Food producing strategies" pp. 371-404.
  "Continental trade and contact" pp. 405-443.
  "Craft, industry and art" pp. 444-487.
  "Warfare" pp. 488-497.
  "Death and the gods" pp. 498-522.
IV Systems
  "Iron Age society and social change" pp. 523-548.
  "Models, systems and beyond" pp. 549-552.
Appendix A Pottery pp. 553-590.
Appendix B Selected radiocarbon dates pp. 591-608.
Appendix C List of principal sites pp. 609-623.
Notes pp. 624-626.
Abbreviations pp. 627-630.
Bibliography pp. 631-673.
Most references are done at appropriate depth, so again the lack of annotations or guidance is not a big problem.
Cunliffe is fairly windy, though, so the number of pages exaggerates the amount of information conveyed.