Wireless is very slow but wasn't before

Hi, my first post. I had BT broadband installed 09/13 and everything worked as it should untill recently when i starting having issues conecting/downloading on wireless (HH4).
I contacted BT and after the usual messing around they changed a few settings in the HH manager, including changing the 2.4 selection to channel 11. Leaving 5ghz on smart wireless. I havent purchased any new wirless tech since moving into the new house in 09/13.
I am still getting a lot of issues with really slow download speeds/times on wireless. When i run the speed tests, everything seems ok, i think.
I will attach all the tests that I have run, the connection has been up and running for at least a few weeks now, without any reset.
Any information you can give will be gratefully received.
Quiet Line Test has been run today = no obvious noise on line.
BT Wholesale Speedtest
Download Speed = 6.94
Upload Speed = 0.38
Ping Latency = 65.00
Best Effort Test
Download Speed = 6.94
Max Achievable Speed = 7.15
Acceptable range of speeds 0.6 - 7.15
DSL Connections Rate 8.13(down stream) 0.45 (up stream)
IP profile for your line is = 7.15
03:15:37, 08 Aug.
( 64.340000) DSL noise margin: 25.00 dB upstream, 14.70 dB downstream
03:15:37, 08 Aug.
( 64.200000) DSL line rate: 448 Kbps upstream, 8128 Kbps downstream
Again any help you can give is appreciated
Davie

you can try downloading inssider3 (istumbler if MAC) and then run it. This will show the broadcasting networks round about you and their channels including your own. If you then enter your router and change your wireless channel to a free or less congested channel.
inssider3.1.2.1
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silirap wrote:
I have a Time Capsule (purchased in the Spring, so it 's the generation before the one that's out now), and 4 Airport Expresses. I'm also using a MegaPlug 85 Mbps Ethernet adapter kit. Whenever I turn off the airport card on my laptop and plug directly into either the MegaPlug or the Time Capsule, my connection is the fastest that it's ever been. Pages come up with barely any perceptible wait. When I unplug and use the Airport to connect over my wireless network, it's much, much slower.
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