Connecting a Powerline Adapter to a Uniti - problem

I have bought a pair of these Powerline Adapters because I'm tired of wifi dropouts on my Uniti..... (my connection via cable is 120Mbps, which I use for two desktop computers, and my laptops and iPhone run perfectly via wifi)...

http://www.argos.ie/static/Pro...Number/1397640/c_1/1|category_root|Office%2C+PCs+and+phones|14418968/c_2/3|19780850|Wireless+networking|14419015/c_3/4|cat_14419015|Powerline+adaptor+kits|26066890.htm

The adapters established a connection immediately and my laptops run like trains on them - I took care to disable wifi on both laptops before connecting them by cable to the powerline adapters.

Also, when I connect the Uniti by cable to the powerline adapter it says connected, just like the laptops, but it will not play any internet stations.

Any idea what might be causing this?

Anything I might try?

Thanks.

D.