Do you mean wide open to being charged under hate speech legislation?-
Yes, If not the entity, then the individual contributors/editor. In a similar way to how Private Eye dealt with/ deals with(?) libel cases and the like.
Because the Daily Mail is not a likely target, their targets are likely targets for hate speech legislation.
Somewhat. The UK press/media are not likely targets due to the proven inability of the UK population to have any real influence over them. See the clusterfuck that is Leveson, The Sun, "Sun on Sunday" and Brooks back in the mix for reference there. It was more just the idea of one of their hates suing them on completely justified grounds that amused me.