Ethernet cabled PC OK .. Wifi Not

Question

We have been seeing a degragation in service for while.
Number 1
So today I set up my PC next to Router and cabled it in. I put my iPad next to the PC ... both within 1m of router.
Clicking on a web site (tried several) the laptop comes up in say 1 second and the iPad takes 10 seconds.
I followed BT Helper and changed WiFi channel but since the iPad is right next to the router, I cannot see interference being the issue.
Number 2
I am not convienced this is purely a WiFi issue as our Sky box is cabled into the BT Router and it takes ages to download TV. I beleive the Broadband connection is dropping and starting. The same happens for laptops, Macs, iPad, etc
Any ideas?

Answer 1

OK done the tests as instructed
ADSL Line Status
Connection Information
Line state:
Connectedppp0_0
Connection time:
0 days, 00:10:24
Downstream:
7.938 Mbps
Upstream:
448 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Fast
Noise margin (Down/Up):
7.6 dB / 25.0 dB
Line attenuation (Down/Up):
34.2 dB / 19.5 dB
Output power (Down/Up):
19.9 dBm / 12.2 dBm
FEC Events (Down/Up):
0 / 0
CRC Events (Down/Up):
1 / 0
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
0 / 0
Error Seconds (Local/Remote):
204 / 39
Broadband Wholespeed test
Downloadspeed 5.4
Upload 0.37
Latency 39.00
Hope this helps.
Cheers Imjolly but same happens when laptop on battery or with another laptop running WiFI and not cable connected.