Documents for use outside England and Wales after being notarised often have to be further authenticated by a process known as legalisation.
In many cases this simply involves the UK Foreign & Commonwealth Office confirming my signature and seal by the issuing of an apostille which is internationally recognised under the Hague Convention.
Some countries may require additional legalisation at their own Embassy or Consulate in the UK. I work with very experienced consular agents who will arrange for Embassy or Consular legalisation quickly and efficiently.
I can advise you of the costs of legalisation and the likely timescale.