In the UK, anyone selling items made of precious metals are required by law to display a Dealer's Notice, which provides customers with information about hallmarking requirements and the guarantee that they provide.
All of my work weighing 7.78g has been hallmarked, as required by law. There are 4 assay offices in the UK: Birmingham Assay Office; Edinburgh Assay Office; London Assay Office and Sheffield Assay Office and an assay office in Dublin.
My hallmark is registered with the Edinburgh Assay Office, which is where I send my work to be hallmarked.
If you have any queries regarding my hallmark, or the hallmarking process, please feel free to contact me.