High turnover of staff. Creates a negative impact on staff moral, but anecdotal evidence also suggests that this is building a poor market reputation amongst both recruiters and peers.
For consultancy salaries are on the low side of average. Compared to operational purchasing the money on offer may seem slightly above average. Either way, not great for a company based in Central London.
3 month notice periods can be good for job security, but are tough on junior people that might feel they need a move but aren't at a career level where a potential employer will wait that long.
Internal promotion seems to be based upon the urgency caused by people leaving rather than being based on merit.
Most major clients are based outside of London, so expect a lot of UK travel and overnight stays.