Due to verification rules and regulations all Power of Attorney (POA) documents, must be witnessed by a practising UK Solicitor or Notary Public. The Solicitor or Notary will be present when the relevant party signs the Power of Attorney and will then add their own certification to state they have witnessed this take place. If your POA specifically references being signed by a UK Notary Public, then you would not be able to have a solicitor sign the document as this is not acceptable with the UK Foreign Office.