I posted your question on your behalf to as you have used your email address as your User Name. If you send me a private message with a new User Name I can update it for you. Thanks - Admin.
The HMRC site to which a link was provided during the MTD VAT webinar (https://www.gov.uk/guidance/find-software-thats-compatible-with-making-tax-digital-for-vat#search-for-software), lists companies with 'software in development' - many of which are additions to existing accounts packages.
Is this a definitive list of acceptable software?
Is there some form of testing/certification/approval required from HMRC or can one use any software that works?
For example, I found this company - https://vitaltax.uk/ . which seems to provide free bridging software for Excel for MTD VAT and links to HMRC's API, but is not listed on the HMRC site.
Can I use it if it works or can I not because it is not listed on the HMRC site?