The queen is head of state and head of the C of E but in a democracy she doesn't have any power unless she chose to use it - and she never has, nor have any other kings for centuries. She is infamous for being politically neutral.
what I find shocking about some views in this thread is the sheer lack of imagination from some posters about the work the royals do. I;m not in favour of hangers on like Andrew and his clan, but the key royals work bloody hard. I assume you've never studied the court announcements to see what a typical day's work is for Anne, or the Queen?
Typically they can have back to back engagements almost every day, in 3 or 4 venues. For someone like the queen to do that at 90 is bloody amazing- 98% of the population is dead at that age, never mind hosting banquets till midnight.
Add to that the fact their lives are lived in a goldfish bowl who would want it?
I'd rather have the queen than a 'president' Blair with his numerous houses all over the place and his pomposity. Like it or not, the Royal family give stability in difficult political times.