Pros
High profile company that is winning lots of work. Plenty of opportunity for interesting projects. A very expansive vision for 2020, double turnover, double staffing levels. Company has a very positive outlook. Benefit package is standard - car allowance, private medical, very good pension.
Cons
Projects tend to be understaffed ( too much work, too few staff). As a result work is stressful, hours long, and unfortunately the pay is not that special. No significant pay rise in three years. Lots of interdisciplinary politics - consultancy vs construction, retail vs private sector vs tech - the list is long. Too much silo working. If you're not in Moorgate then you are probably going to be forgotten from an advancement point of view.