No-one seems particularly convinced of this site.
Pastscape (under the record for Lacra D) states:
An alleged second circle immediately to the north-west [of Lacra D] comprises three pieces of stone visible at ground level and cannot be certainly identified
Aubrey Burl in A Guide To Stone Circles Of Britain, Ireland and Brittany (Yale) states that Lacra E is “a very uncertain ring cairn” that “can be imagined 25ft (8m) to the north-west [of Lacra D]“.