Bloody hell, it was 17 years ago when i did it. If you need to give evidence for something use the STAR format, (Situation, task, action result). One tip i used all those (ahem) years ago was get a copy of the chief constables annual report for the last year, this will give you a heads up of policing initiatives, stats etc.
Sorry I can’ t give you much more advice. Good luck.
And yes, it takes about 12 months to process.
A few forces now are going down the route of only recruiting from the specials or sending new applicants on a degree in policing.