MTD module errors with "the provided Vrn is invalid" if the VAT Registration No. in Company information is prefixed with the Country code. Prefix with GB is good practice for multi national companies and the MTD program logic should really be able to handle either GBnnnnnnnnn on Company Information - hidden logic can detect and strip the GB off if need be. This is frustrating for clients as it means they have to choose between MTD working v Customer Facing Documentation showing the GB v hard coded documentation layout modification to insert the GB.

Realise not a catastrophic problem but really a niggle the client shouldn't have to deal with.