In the earlier years of the British revival, 1950s, many scholars on both sides of the pond would quote Lloyd and perhaps can be excused for doing so as there weren't that many scholars around at that time who were knowledgeable enough re folksong, particularly on this side of the pond. For at least 20 years now, probably longer, no British scholar worth their salt would have quoted Lloyd on anything without corroboration from a more reliable source or at least an earlier source.
He is highly regarded as a performer and pioneer but for a long time now we have known that his scholarship leaves a lot to be desired.