AFRS(Agricultural Flat Rate Scheme)

I was just wondering if any practitioners have had any enquiries from HMRC recently regarding the Agricultural Flat Rate Scheme(AFRS) for farmers and if so what type of information/questions were the inspectors from HMRC posing that caused any problems for their clients and also

if HMRC took steps to deregister the farmers or businesses concerned from the scheme because HMRC deemed they were claiming too

much input vat through the AFRS than they would be under the normal way?

Thanks in advance for any help.