The link on Harry's Place gives further details:
Here are their names and sites.The Iranian Embassy in London is at 16 PRINCE`S GATE LONDON SW7 1PT
Mojtaba Saminejad (who was arrested at the beginning of November for speaking out against the arrest of his three colleagues in his blog); and
The telephone number is (+44) 2072253000
The fax number is: ( +44)2075894440
E-mail : INFO@IRAN-EMBASSY.ORG.UK
Something for you to do today. Write and protest.