Originally Posted by iainmann:
“I'm on channel 11 and there are other BT Home Hubs around me on the same channel...but changing to 9 or any other doesn't improve things.”
You'd need to change further way from 11 than that. try either 1 or 5.
Make sure that the macbook is configured to actually use 802.11n.
Do you have any older computers connected to the Wi-Fi that only support 802.11g, if you do then whenever it is active it forces the entire network to slow down.
Make sure that WEP is disabled on the router, even if it is not used (and you should not be using it) it reduces trhoughput.
If you can use only WPA2+TKIP is gives a lower performance hit that WPA+AES.
Consider getting a dual band router, a significant cause of reduced throughput is wi-fi interference and with effectively only 3 usable channels at 2.5GHz it can be hard to find a clear channel if you have lots of neighbours with Wi-Fi. The 5GHz is much quieter and offers better channel seperation so congestion is less of a problem and 5Gz offers higher max speeds to boot. Modern macbooks support 5GHz, but you may need to upgrade the wi-fi cards on it and other devices if they do not.
If all also fails consider one of the new 802.11ac routers (you will probably need to upgrade the wi-fi cards on most of your devices to get best use of it).
Realistically though wi-fi never gets anywhere close to the headline theoretical speeds and it is generally not worth paying for broadband speeds over 50Mb/s if you are not able or willing to used wired network connections, as you will not see the full benefit of it via Wi-Fi unless you regularly have multiple users making use of it at the same time.