That particular unit is 120v for US mains power Mark. Mains voltage in the UK is 240v
I am not aware of any similar converters available in the UK. If there were I am sure I would have heard of them because many people would like a relatively cheap way to convert to VS. The usual route to conversion in the UK is a three phase motor and inverter which, as Eamonn says, would cost more than the lathe.