They vary enormously. A lot have to do with prompt payment. For example, let's say I've been chasing this council for months—typically for quite small sums, 1,000 pounds or a few hundred pounds—and not getting any results: “Can you help me?”
One I particularly enjoyed was at Crown Commercial Service. We had let a series of lots for a particular framework agreement over Christmas. We chose some quite family-unfriendly times to do that. We required all the applications to come in on January 1 or something. The whole of the holiday season, we were all going on leave and expecting our potential suppliers to complete documentation for us. The complaint came in, and we said, “Oh, okay. We hadn't thought about that. We can stagger the responses and we can give extensions.”
So quite often it's to do with the time period. It's also to do with whether financial thresholds, or requirements for insurance, or requirements for a particular kind of accreditation are reasonable and fair. Lots of different kinds of things come in. It's essentially anything that could go—