Only UDP protocol is used for this purpose on port 9, so you do not need to forward TCP (unless you're using some fancy internet WoL application?
I am not sure how the BTHomeHub naming of addresses works, but I would consider using the following address/subnet:
192.168.2.255/255.255.255.0
or directly your PCs static address:
192.168.2.10/255.255.255.255
The latter will work if you have set up the static IP address 192.168.2.10 in your router to your PC's MAC address.
PS. Bear in mind that some applications which enable WoL across the Internet do not use port 9.