Warwick isn't really in the same regime as the others as far as engineering goes; they're better known for maths/CS/business/economics. Southampton, Strathclyde, Sheffield, Heriot-Watt, Oxford or Cambridge are, in my eyes, stronger options for both engineering generally and civil engineering specifically, than Warwick. Bath has a lot of links to the built environment sector specifically as I understand, between both it's civil engineering and architecture courses. Bristol is well regarded generally for engineering but I don't know how specifically well known their civil engineering programme is.
UCL gets quite polarising reviews for its engineering department; some of these I get the impression are due to unrealistic expectations, of how uni study works generally compared to school study i.e. lecturers aren't teachers and it's up to the student to take the initiative with their learnin,g and also of it's apparent position in relation to other internationally renowned engineering unis (e.g. Imperial, MIT, CalTech, CMU, Ecole Polytechnique, Oxbridge, etc). However there may be some merit to other complains, and they may well indicate overall "bad culture" in the department.
That said, realistically all of them will have similar graduate prospects, provided you make sure to undertake appropriate work experience/placement/internship opportunities during the degree. I have emphasised this because these days, that is what separates applicants in the graduate job market; where you studied doesn't make much difference these days, be it at a "top ranked" uni or otherwise; recruiters now tend to focus much more on work experience and how well the applicants can relate their studies to employable skills in the work place. Simply turning up to lectures at uni (a "top ranked" one or not) and taking exams doesn't cut it these days. For engineering I'd really recommend focusing more on thinking about the structures of each course, what options are (or aren't) available at each, as well as more practical aspects of the uni location, amenities, costs and so on, than the "ranking" of each uni (in league tables or as perceived by individuals).