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I hate to state the bleedin' obvious, but a useful start might be made by reading a recent book about the archaeology of Offa's Dyke, such as D Hill and M Worthington's 'Offa's Dyke: History and Guide' (Tempus, 2003), rather than anything with 'Avalon' in the title. Blurb for Hill and Worthington's book as follows:
"Offa's Dyke is not self-explanatory. The fact that 'a great green bank and ditch strides across the hills and vales of one of the pleasantest parts of these islands, the Welsh Marches' does not betray its purpose or its creator. Through survey work and excavation we know much more and, as this book discusses, we can now trace most of the 64 miles of earthworks stretching from Rushock Hill in the south to Truddyn near the Dee estuary. Based on years of experience studying Offa's Dyke, David Hill and Margaret Worthington present a mile-by-mile description and analysis of the dyke placed within the social and political context of Offa's reign of the kingdom of Mercia (AD757-796). The planning, building and function of the dyke are considered, illustrated with medieval-style comic strip sketches, and Offa's dyke is placed alongside other types of earthworks. 192p, 56 b/w illus (Tempus 2003)"
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