Have done that but still get error 014 repeatedly (BT Home Hub 2)
Ah, the joys of the HH2:(
Your best chance of overcoming any issues when connected to such a hub (I've owned 7+) is to hit the red recessed reset button on the rear of the hub for around 15 seconds until the lights go out completly. Then release the button. Allow the hub to reboot and try to connect again.
Before you do this, disconnect ALL the devices and reconnect the Now TV box first so that this is allocated the first IP address (192.168.1.64), then reconnect all other devices that connect via ethernet next and then finally wifi devices.
As an option, once they are connected you can carry out a power cycle of the hub (switch it off and on) as this should fool the hub and give the devices a static IP address (a bug that I brought up in 2009). Then change the DHCP lease time to 21 days - the latter helps prevent your devices from getting 'kick off' the hub.
What actually happens is that the hub becomes clogged and it needs a clean out. Here's not really the place to go in to much more detail, but you'd find a stack of stuff from me (old stuff as I quit there some time ago) and many others over on BT's forums.
That didn't work either.
Surprised and pleased at the same time - Well at least you can rule that out;), which IMHO could well of been the cause hence my initial reply.
How far is the box from the home hub?
If it's near enough touching the hub, give it at least 6 inches distance
If it's far away, try within 2 feet as a test.
Also, try setting the wireless encryption to just WPA2 and not the default of WPA and WPA2.
Any joy now?
If not, if you navigate to the home network page, can you see the Now TV box?
One thing you might be able to try is to change the settings as suggested above by @Rich-L : changing the wireless channel to 6 (or Automatic if it is set to a different number) and possibly changing the security to WPA. (It's a good idea to be set to WPA anyway, since it's much more secure.)
To do this on a Home Hub, I believe you do the following:
1) In a browser go to: http://bthomehub.home
2) Click on Advanced Settings and log in with the password. (Either you will have set this, or it will be displayed on the base or back of the Home Hub 2 machine.)
3) Click on Wireless and you should see a screen that allows you to set the security and the channel.
4) Once you've changed these, click Apply.
Certainly, those are the steps I saw on my HH3 and currently see on my HH4. With any luck, one of those two changes will fix things!