Pros
Working at Head Office offers free parking (if you're willing to get up at the crack of dawn to get to the office by 8am otherwise you'll have to pay!) There's also a subsidised canteen (it's a running joke most Head Office colleagues put on 1stone in the 1st year). There are also some nice people to work with (note: these are generally NOT the senior managers. If senior managers *are* nice to you, it's probably because they're trying to show that they're "good manager material" to their own line manager, in order to get a promotion.
Cons
If you're not a senior manager (B grade or above), be prepared to work long hours for lower than market rate pay. Be under no illusion, you are just a very small cog in a very large (green) machine, and as such, easily dispensed with. You will be expected to show the *right* "behaviours", which basically means that senior management want you to "behave" (ie; they don't want the 'worker bees' causing a nuisance and taking up time / energy / money to 'sort out'). If you're wiling to be a well behaved drone, then you will go far. Be prepared to work in a niche job with no prospect of promotion (unless you fully embrace the "happy clappy" world of back-slapping). If you're trained in any specialist area, don't expect to be acknowledged or rewarded for it - any contribution over and above your designated job function will be frowned upon. Generalists are appreciated - Specialists are to be quashed. Box ticking is the name of the game if you want to succeed. (And no, I wasn't 'let go' - I just saw through the cracks, and have moved on to a better / better paid job!)