Not a full list by any means list.
Taken from notes made over many years of research in the writing of "This Mighty Isle".
These listed, are the ones that raised my imagination.
Proper recognition to authors and book titles given at end,but Not in any order or detail.
My thanks to all these Authors.

"Padraic" St Patrick.He had been taken captive in Britain.He had the Blue painted eyelids and hair shaved across his head in the Celtic style,not the Roman Tonsue.[In the Yellow Book of Lecan Tells that Padraic *burnt* one hundred and eighty books of the Druids of Erinn (Ireland) after that many christworshiper didst the same.][Remind you of anything?]

"Pin-Hole Cave" Derbyshire.A Carved Figure of a man Wearing a Ritual Horse Mask.

"Paul St" [In London, a Druidic Circle Burried in the Foundations,Recorded in the memoirs of the son of Sir C Wren.]

"Pernicious"Images of Hell,Developed by Distorted Forms of Christianity.

"Pheryllt" Alchamists in the Magical City of Emrys in Snowdonia.[also known as "Dinas Affaron" The City of the Higher Powers.

"Prydain" Son of Aedd,Soverenty of Briton.One of the three pillars of Briton.

"Pwyll" of Narberth [Lord of Annwn]Marries Rhiannon.(First Branch of the Mabinogion)

"Pryderi" Killed by Gwydion(Wild One)using Magical charms.Burried at Maen Tyrianc above Melenryd.

"Pren Awyr" Celestial Tree,Oak in Briton.

"Pontiff" [The Strange Continuance in Christianity of the Original Pagan Title of Chief Pontiff,which the Bishop(Pope) of Rome is.]

"Propolis"Bees produce propolis to smear on hives to stop infection.It also as healing properties

"Pythagoras"Lived on the Greek isle of Samos,then moved to Croton,southern Italy.This part of Italy exported the Ionian wares to Briton in exchange for "Tin"thus obtaining its classical name "Cassiterides Siculus" (circa 90-21 bce.)

"Plato" Golden Number 216,Largest Interger Number of any Significance.

"Prydwen"[ The White Boat,The Fair Oared,The barge of Avalon,]

"Palladius" Sent from Rome 132ce,To become a Bishop of the Irish long before Padraic (St Patrick)

"Puffin Island" The Original Cair Sidh (Anglesey){Spiral Castle}

"Philosophy"Druidic.From Darkness Springs Creation.[To Treasure the Pathway,more than the Place it leads.]

Book of Druidry(Ross Nichols)Mythology of the British Isles(Geoffrey Ashe)Ancient Faith of Britain(Dudley Wright)Druid Way(P Carr-Gom)Druid Renaissance(P Carr-Gom)The Encyclopedia of Celtic Wisdom(Caitlin and John Matthews)Glastonbury,Avalon off the heart(Dion Fortune)The White Goddess(Robert Graves)Druidry(Philip Shallcrass)Avalonian Quest(Geoffrey Ashe)Druid Animal Oracle(Philip and Stephanie Carr-Gom)Arthurian Myth and Legend(Mike Dixon-Kennedy)The Voice Within the Wind(Greywind) The Druid Sourse Book(John Matthews)Gods of the Celts(Miranda Green)The Lore of the Bard(Arthur Rowen)The Celtic Year Book(John King)Pagan Pathways(Emma Restall-Orr)Act of God(Philips)Bloodline of the Holy Grail(Laurence Gardner)Dead Sea Scrolls Deception(Richard Leighand Michael Baigent)Magi(G Ash)Witches,Druids and King Arthur(Ronald Hutton)Living Druidry(Emma Restall-Orr)The mystical Qabalah(Dion Fortune)Secrets of the Druids(John Matthews)