OK spent an hour and a half cycling the last remaining bits of Cottenham this afternoon, mainly Smithy Fen. As far as I know that's all of the roads on the map now (once it updates). I also added 6 post boxes, one telephone, the fire station, the pharmacy, one shop, the war memorial, the fuel station and the recreation grounds with their various sections. I also covered a bit of Rampton, including the moat around Giant's Hill. I tagged it as waterway=moat, which isn't a standard tag but a proposed feature, and therefore presumably won't show on the standard renderers. I added a point in the centre historical=archaeological_site, name=Giant's Hill so at least that will appear.

What are still missing from Cottenham are the various footpaths and bridleways surrounding the village, and Cottenham Lode, which I think probably counts as waterway=stream even though it's clearly manmade - I guess the original course was similar but probably changed from year to year, and the banks were built to prevent flooding and enable agriculture on the surrounding land. That's a job for next weekend.