Work with the smartest people in the world
Unless you happen to be the number 1 researcher in your field and can get an academic position, there are basically zero career progression options.
The salaries have to be comparable to other UK institutions (ie, not terrible but fairly modest compared to equivalent jobs working in industry), yet thanks to the well paying companies in the city the cost of living in Cambridge is very high - so actual disposable income is therefore relatively low.
Academics (ie, lecturers and above) are treated like royalty (perhaps deservedly), while everyone else is effectively a second class citizen (generally undeservedly), almost like a caste system.
Short term (1-2 year) contracts are the norm for all types of position except academics (who are wheeled out when they die), which means there is quite a high churn. Generally speaking people don't have trouble finding the next contract after their allotted 2 year stint, but it places an unhelpful level of stress towards the end - and naturally makes people look for (and often find) pastures new.
Pre-reading for your interview should include the latest editions of The Economist and The Guardian.