"Sequels" in music are rarely successful, but that's not the case as far as Archeology is concerned. The basis was naturally the same i.e. "Pre-fab Four" concept presented 18 years earlier in All You Need Is Cash movie and soundtrack, but with definitely fresh "reading of the subject" and all 14 new - or semi-new as 2 or 3 of them were recorded during "original" Rutles sessions, while some others launched before by Neil Innes on his solo albums - tunes of great quality also outside the Beatles context and references.
For certain reasons and some bad luck in timing of the release, Archeology was not much successful with neither Fab Four nor general public (despite big hit potential of not only Shangri-la, but also some other songs). It's a pity, as its better performance on charts would certainly also result in more attention drawn on other 80s and 90s achievements of Mr. Innes - one of the most noble, intellectual - and very human - artists in contemporary music, unfortunately totally unknown to younger generations (though still active: recent tours, both solo and with reunited Bonzos, were in 2005 and 2006, unfortunately again - only in cameral UK and US halls).