Guernsey is where I have spent most of my life and is woefully underrepresented on the Internet.
If you are responsible for the country-lists on your web site please refresh it with the official ISO-1366 country list as Guernsey, Jersey and the Isle of Man were added in 2006 but still not listed as countries in many many places (Sony Station & Facebook to name two off the top of my head).
Guernsey Estate Agents
Comprehensive list of the estate agents in Guernsey.
Deliveries in Guernsey
International delivery companies use local agents to represent them.