I've found a mislaid Abbey Nat. share certificate. Can I do anything now to change this to Santander shares?

Answer 1

Write to the Registrar. There is a process for identifying you as a shareholder and issuing you with a new share certificate.

Answer 2

Here's a helpful site:
http://money.uk.msn.com/Investing/Insight/Special_Features/The_Share_Doctor/article.aspx?cp-documentid=143152

If the shares were never reported as lost or stolen, they can still be exchanged. Contact the registrar.

Answer 3

yes and is very simple ring them and they will tell you were and how to change.