said by ronson9:
One thing I notice now though is that I'm no longer able to get into the Speedtouch menu by using 192.168.1.254 - is this normal for a router set-up?
Yes, that's entirely normal. The router sits on the internet-facing side of your router, while your PC sits on the private-facing side. Some routers/firmwares will allow you to specify the IP address of your modem and pass this traffic through for you, enabling access. I believe you can also do this manually in many routers.
To be honest, I've rarely had a need to do so. One the modem is in bridged mode, and the modem is properly configured, everything works transparently. On those few occasions when I do need to access the modem directly, all it takes is to switch around a couple of network cables, and reconfigure my IP address settings on my computer. For the number of times I've ever had to do that, it's just never been worth the trouble of figuring out how to pass the traffic through.