IPhone 5S won't use 802.11n

Recently I was messing around with my WiFi router's settings to test moving to a 5Ghz spectrum from the 2.4Ghz one.  Sometime during the process I noticed that my iPhone had disconnected from the router and would not connect to it no matter what I tried.  As a last resort I turned off the setting that required all devices that were connected to be using 802.11n.  As soon as the setting was changed my iPhone connected to the wireless network.  When I looked in the connected devices tap it said that it was using 802.11g.  To my knowledge the phone was using 802.11n on iOS7 but something changed after the update to iOS8.1.  Is this a software problem (and are other people experiencing the same problem), or could it be a hardware problem with the phone?

I have EXACTLY the same issue & and just spent nearly an hour on the phone with BT trying to get an answer, to no avail!
My setup is:
BT HH 2.0 set up for 8011.2 b/g/n (as recommended)
BT HH has BTFon on and sharing - as well as BT Openzone
Several mobile devices - but let's focus specifically on the Dell Latitude E6510 with an N-Series wireless card
The scenario is:
My BT HH is showing an 'actual data transfer speed' of 130Mbps
My laptop connects to the BT HH SSID at a constant 54Mbps
My laptop connects to the BT BTFon SSID at a constant 130Mbps
My laptop connects to the BTOpenzone SSID at a constant 130Mbps
My laptop connects fine to other N-Series routers at 130Mbps outside of my home - so I am ruling out any configuration issues with the laptop.
There are no other wireless devices connected to the router at present. 
I've used inSSIDer 2.0 to validate that the router is broadcasting at 130Mbps using 802.11n and the signal is constantly strong
So, why is my laptop unable to achieve a speed of 130Mps from the router?
Why can I achieve better throughputs if I connect to BTFon or BTOpenzone?
My question to the BT Support staff (for which they had no answer) is if I am enabling BTFon and BTOpenzone on my router, is that in some way reducing MY internal throughput in speed?
The BT HH 2.0 is promoted as an N-Series device - yet I cannot use it as such - and I make use of the BTFon community as I travel about, so I do not want to switch it off. 
I know that I can connect via Ethernet to the HH, and do when I am static - however, I also stream some large files/videos around the house, for which N-Series is perfect - when it works!!!
Any advice / help gratefully received.

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    [12101.160208] iwlwifi 0000:03:00.0: Radio type=0x0-0x3-0x1
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    description: Wireless interface
    product: Centrino Ultimate-N 6300
    vendor: Intel Corporation
    physical id: 0
    bus info: pci@0000:03:00.0
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