There's a sporting goods store (similar to an REI) a few blocks from Wimbledon. They have everything up at the front of the store for Wimbledon campers and for solid prices. We got a 3 person tent, a mat, two sleeping bags, to mini pillows, two chairs to sit on outside during the day and a soccer ball to kick around for about $150. If you bring the tent back within 24 hours they give you 50% back...we didn't do that as it would have been a hassle. So we took our tent to a donation area where campers who didn't bring a tent can just use it and put it back.
Most everyone was asleep by 10:30pm, and with how light it gets early in England this time of year, most were up by 5am. We brought some food to get us through the day, but hey also had 7 different food trucks set up that were open from 6am - 11pm which was solid food.
The bathrooms were upscale porta potties, each had their own mirror and wash station inside the little porta potty. They were very clean considering the circumstances.
The whole experience is a massive credit to the Brits