Servicing is every 9,000 miles or 12 months, whichever comes first. The services go P1, P2, P1, P3 so assuming you had a P1 done in 2008 when it was a year old it will now need a P2 as it is 2 years old Costs vary from area to area so I'd phone around and see who's offering the best rate.
Not sure on the alarm issue, hopefully others can advise.