The person I care for has been getting ESA(CB) Support for a while now, having been awarded a 3 year period.
After the 17th payment, there was a phone call out of the blue for a mandatory review, not of the medical side of things, but the money aspect, what other benefits, changes in financial circumstances etc.
This was from a DWP FEPS- fraud and error prevention service unit. Took about 15 minutes of grilling.