I hear that changes are occurring to the Government Gateway service. How is this going to affect the administration of users for small companies for services such as VAT and PAYE

Hi William
I am not sure which business areas you are referring to. The only annoucements to Government Gateway is below. I hope that helps.
https://taxagents.blog.gov.uk/2018/02/08/changes-to-managing-your-client-lists-online-tax-agent-blog/ talks about changes to Govt Gateway access for agents from 26 Feb.
Kind regards