There are 3 books in the The Song of Albion series. The newest book is The Endless Knot which came out in 1993.

Wolves in Oxford; extinct beasts in Scotland: the barriers between our world and the Celtic Otherworld are breaking down. Two men are drawn into Albion, and changed for ever.
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2
The Silver Hand

Book cover of The Silver Hand
"Before Albion is one, the hero feat must be performed and Silver Hand must reign."The great king, Meldryn Mawr, is dead, and his kingdom lies in ruins. Treachery and brutality rule the land, and Albion is the scene of an epic struggle for the throne. Lewis is now known as…