Leave is done on a closed phase where you can make a bid for what you want, followed by an open phase where you can book any remaining available leave directly through an online system. Leave can be taken as a whole block or individual days. So yes on the fixed pattern if you took 5 days you would get your 7 off days around that block. The first phase is worked on a points based system with popular days like Christmas attracting more points. The lower your points are, the higher chance you have of getting what you want.
There is LOL (which you can top up through the benefits system) and death in service benefit.