FORS accreditation and gaining

Hi folks, was just wandering if anyone out there had been involved in gaining, or knew a bit of background regards gaining FORS. Iv lost touch a little with it having not worked with for so long, but am attending an internal meeting regards it. Was hoping to be armed with a few criteria, pitfalls, differences in going from bronze - silver, silver - gold etc , differences and allowances between each band etc. thanks in advance