An archaeological fieldwalking survey (FWS) was carried out by Colchester Archaeological Trust (CAT) in September 2011 at the Northern Growth Area Urban Extension (NGAUE), Colchester, as part of the first stage of an evaluation and in advance of geophysical survey and trial trenching. The total area walked was 49.84 ha of arable (the NGAUE site is 110 ha. In total area), and all available ploughed land was fieldwalked. However, an additional 3.55ha was unavailable due to the presence of a crop of mustard and the Cants Rose Fields.<1> The survey was carried out in accordance with standard Essex fieldwalking methodology. The methodology was based on a rectangular grid tied into the Ordnance Survey National Grid (centred at TL 986 279). Within each hectare, a 10% sample was achieved by collecting all surface finds from five parallel, 2-metre wide collection corridors spaced 20m apart, giving 25 collection units (or ‘stints’) in each hectare. Finds were counted, weighed, and plotted onto a map base at a suitable scale, typically one sheet per finds type. These plots allowed a comparison between groups of finds and an assessment of whether they are ‘significant’ or not (significant usually defined as 2 or more adjacent boxes in which the finds are at or above 2 standard deviations (ie, +2sd) above the mean weight). Finds were generally quite thinly spread, but there were three significant groups: an extended scatter of medieval pottery on the fields to the east of the 1973 excavation site (A1, FWS boxes B85, B86/B96, TL 9885 2850); a scatter on the field south of the 1973 excavation site (A2, FWS boxes B72/B73, TL 9875 2818); and one of Roman brick/tile (A3, FWS box D48, TL 9845 2775). Prehistoric finds consisted of eight worked flints and one burnt flint. No prehistoric pottery was recovered. There were only four Roman potsherds. Medieval finds consisted of medieval pottery (639 sherds, 5877g). There were small quantities of medieval pottery in the southern part of the survey area (i.e., Km squares C and D), but there were two large and statistically significant clusters in the northern half (Km A and B). These were in the northern half of ha box B72 and the southern half of box B73 (centred TL 9875 2818), and obliquely across boxes 85 and 86/96 (centred TL 9885 2850). These were referred to as ‘sites’. The first of these sites (ie, in boxes B72/B73) is previously unknown, but the other (boxes B85/B86) is closer to the Petchey 1973 excavation site, and (the report suggests) may provisionally be interpreted as further evidence of medieval potting in that area. The evaluation followed a desk-based assessment by Colchester Archaeological Trust (CAT Report 583, March 2011).<2>