An amateur archeologist is investigating after spotting round aerial marks in west London reminiscent of a prehistoric henge.

Lance Belsham, 49, of Dagenham, has spent two years researching the Hounslow marks, which resemble earthwork rings.

He is pressing ahead with the research with the help of two relatives, but English Heritage said there was not enough evidence to ascertain if the site, spread across several fields, was of national significance.

An English Heritage spokesman said: “English Heritage only recommends the scheduling of an archaeological site where a precise time period and site type can be firmly identified and where it can unequivocally prove it is of national significance.

“Unfortunately, we have not received sufficient information from the applicant about this site and are therefore unable to make a designation recommendation to the Department of Culture, Media and Sport.

“However, we are grateful to the applicant for bringing this site to our attention and we are investigating ways in which we might be able to help the applicant to establish a firm attribution to the crop marks north of Osterley Park.”