You can simply configure the 8630P to use the same SSID and passphrase as your main router. Also, set them both to fixed channels, and use non-overlapping channel numbers (at least four apart). While you are picking channels, survey your surroundings and choose channels that aren't busy with neighbouring WLANs.

That's very helpful thank yoy. So i need to stop using the vodafone original router ssid & just use whichever shared one i chose for the TP powerlibe devices, is that right? Surveying surroundings to find channels that arent busy soynds good, but how do i do that? I tried chosing chanbels at randon to see if signal 'seemed better' but is there a more objective/systematic method? Further questions: if each is on a different channel will the computer 'switch' between them thus interuppting signal? & what do i do about the difference between the channel on 2hz & the channel in 5 hz for each (since 2 hz is 1-16 or simillar & 5 hz is more like 36-48) I realise there is an awful lot i dont kniw about networking so very grateful for you help Best wishes

You copy the SSID and passphrase from the Vodafone router onto the TP-Link devices, and make sure you use different channels. Do this for both 2.4 and 5 GHz if present.

Devices will roam from one channel to the other typically when they lose signal from the farther one. How intelligent or quick that is depends on your device. Some phones, tablets and notebooks are more aggressive in this, some cling to the weak signal until it completely fails. This is configurable in some few of those.

Site surveys are best done with an Android phone and a suitable app. Some routers and access points even have a built-in feature for this.

Fab. Thank you, i'll see if i can find an app.. So then do i just get my devices to 'forget' the original ssid provided by my router when i 1st installed it withoit the powerline extenders or is there any advantage to changing that ssid to the same as the other 2 as well? My final (i hope!) Question is; i was expecting the led on the adapter with the 'network' symbol (branching flow chart type pic) to light up when the 2 powerlines were working on the same network, but assume they wont if i'm just cloning by coping the ssid manually. Is that correct & does it matter? Thank you

Just reuse your vodafone routers SSID and passphrase on the extenders. Your devices will connect to the extenders using the information they already have.

The LAN indicator LED will light up when you connect a LAN cable. Powerline link indicator is the one that looks like a house.

Thank you very much: Having re-read all those answers more carefully now, I think I understand better & was just being slow on the uptake. Thank you for being so patient!

also you can try to manage the wifi by tpPLC utility : http://uk.tp-link.com/download/TL-WPA8630P-KIT_V1.html#Utility
and the videos mey help: http://forum.tp-link.com/showthread.php?98474-Video-for-powerline-products-including-trouble-shooting

I'm very glad I found this thread because I was stumbling around looking fruitlessly for the tpPLC Utility download (TP-Link has done a great job hiding this). I have the TL-WPA8630P kit and want to just change the password that came by default. I've now installed tpPLC on my laptop, and the laptop is connected to the TL-WPA8630P network. The utility guide says "Simply connect your computer to a powerline device via an Ethernet cable orwirelessly." But although I'm wirelessly connected, the utility is telling me I'm not. It's a pain to connect with a cable, so what's wrong?

I'm very glad I found this thread because I was stumbling around looking fruitlessly for the tpPLC Utility download (TP-Link has done a great job hiding this). I have the TL-WPA8630P kit and want to just change the password that came by default. I've now installed tpPLC on my laptop, and the laptop is connected to the TL-WPA8630P network. The utility guide says "Simply connect your computer to a powerline device via an Ethernet cable or wirelessly." But although I'm wirelessly connected, the utility is telling me I'm not. It's a pain to connect with a cable, so what's wrong?