The review focuses on digital display advertising – thought to be a new area for the company.
Notonthehighstreet.com currently handles pay-per-click search marketing in-house.
M2M won the offline media account in September 2013 after a five-way pitch. The digital media business was not part of that review.
M2M is involved in the latest process.
Notonthehighstreet.com appointed WCRS to its ad account in February after a pitch. The agency’s first work targets people looking for Father’s Day presents. The retailer previously worked with BMB.
A spokesman for Not-onthehighstreet.com did not respond to requests for comment in time for publication.