Not to much of a problem for those ADIs who don’t receive the booklet there is after all masses of information available about the test changes from MSA GB the other NASP members and of course on GOV.UK
However, it is a condition of being on the ADI register that the DVSA are kept informed of an ADIs current address and there is a danger that an ADI might not receive a standards check invitation or other correspondence which could result in their eventual removal from the register.
Letting DVSA know about a change of address is an obligation for all ADIs and they must update thier ADI registration within 7 days if they change thier name or address. This is easy to do online at Manage your approved driving instructor (ADI) registration. If you need help with the web site you can email firstname.lastname@example.org
Approved Driving Instructor Registrar
Driver and Vehicle Standards Agency
The Axis Building
112 Upper Parliament Street