The old 3 year service plans (pay in one lump) used to include the Bfc whereas the used car service plans (2 years 20,000 miles) didn't. As far as Iwas aware the new service plans didn't include the Bfc but I may be wrong, I will check at work tomorrow it may be the mot I am thinking of!
Your first Bfc is at 3 years then two years ever after ☺
Either way all the serviceplans save you money