BT might be throttling you: ::. Kitz - ISP Caps, FUPs and Throttling .::

Have you tried downloading outside of peak hours? Any change?

Try changing ports. In LW tools > options > advanced > firewall config. Change LW's listening port to 65000 (or try any ports in the range of 49152 - 65535) > apply > ok. If you have port forwarding set up for a modem/router, you'll need to change the port forwarded to match LW's new listening port. If you have a specific port number allowed thru a software firewall, make sure that you allow LW's new port number. Click to see Sample image
Restart LW.

I thought that the HomeHub was also a router
BT Home Hub explored

Do you have port forwarding set up for either the HH or the Netgear?? What model is the Netgear (have a look underneath)?