Why can't I access the internet via ethernet port on my Airport Express?

I have an Airport Extreme base station and two Airport Express units. The Extreme is connected by ethernet to a BT Home Hub (BT is the internet provider). The network works for all the other computers that have Airport cards BUT I want to connect a Mac Mini (no airport card) by ethernet to the Express, but no matter how I try re-jigging the settings on the base station and Express, it won't connect. Mac Mini WILL connect when wired directly to the Extreme base station, so it's not the port. Also, I have been able to stream iTunes to the Express units so they are functioning in that respect. What am I doing wrong or not doing? Do I need to set up a WDS? Is there a bridging mode? Do I need to have a relay? Surely internet via the Express is possible!

The Airport Express units are the A1088 variety. The Extreme is A1354. Originally I set up the base station to create a network and got the Expresses to 'join network'. However, since that didn't work, I dug a little deeper and investigated WDS and bridge settings. The base station wireless mode is 'Create a network'. I selected 'allow this network to be extended' and made sure that the channel used was the same as the Express units. I have set up one Express to be a WDS remote and one to be a WDS relay on the same channel of the same network with the same password. I have specified the MAC address of the base as the main and the other MAC addresses in the appropriate places for the Expresses. I have tried selecting the 802.11b/g radio mode manually as well as in automatic. Access control is off for all units. I have tried the base station connection setting on 'Off (bridge mode)' and 'share a public IP address'. Am I just missing something?

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