Do NOT search the web. You can get what you need from the repositories.
Downloading from the web is a sure fire way to mess up your computer.

How to search in Synaptic:
http://ubuntuguide.org/wiki/Ubuntu:Hardy#Searching_for_a_package.2Fprogram
How to install multimedia codecs:
http://ubuntuguide.org/wiki/Ubuntu:Hardy#How_to_install_multimedia_support_on_Ha\
rdy_Heron

What we need is some of our UK members to tell you what you need precisely. We
outside of the UK don't even know what iPlayer is.

A quick search of Google revealed this:
technologytales.com/.../