Two local environmental campaigning groups, Friends of Lewes and the South Downs Society, are joining forces to fight a proposal to build 200 new homes on a greenfield site in the heart of the Ouse Valley between Landport and Malling.
Development there would be a worrying precedent for building on other greenfield sites on the edge of town or elsewhere in the National Park.
Details of the proposals are available on Lewes District Council website.
A further round of consultation is taking place between 7 August and 2 October, with a possible reopening of the public inquiry in the autumn to consider comments on this site.
While the Societies will be putting forward a strong objection to the 200 houses proposed for Old Malling Farm, it is vital that members of the public make their views known.
Send in your comments by emailing firstname.lastname@example.org or by post to Lewes Planning Department, Southover House, Southover Road, Lewes, East Sussex, BN7 1AB.