In the UK, there are two forms that have to be submitted online. They are the VAT report and the EC sales list.
Both reports are fairly basic. The VAT report has 8 values apart from the registration and date. The EC sales list is a 3 column list. Customer VAT Reg, Transaction code, value.
All accounting software in the UK has a button in the VAT section called "Submit return". This creates an XML file and transfers it to the HMRC site. This uploads the file, there is a handshake and an acknowledgment.
We need this to be considered seriously in the UK market.