You should contact Equiniti Limited in the first instance who will arrange to send you the relevant forms for completion. In order to have the shares transferred, you will normally need to provide the Registrars with a court sealed copy of the Grant of Representation and a completed Stock Transfer Form.
A Grant of Representation from England, Wales, Scotland and Northern Ireland are accepted. A Grant of Representation issued by a Commonwealth country/territory or the Republic of South Africa will also be accepted, as long as it had been resealed in England by the High Court of Justice. For all other countries (including Republic of Ireland, Isle of Man and Channel Islands), a UK Grant of Representation sealed in the High Court of Justice is required.
If, however, the market value of the shares is less than £10,000, and the overall value of the estate is less than the inheritance tax threshold, it may be possible to use a special small estates procedure. Please contact Equiniti Limited for the relevant forms.