Thanks for the reply Rob!
So, from that, I believe my plan of attack is.....
1. Order cable modem from NTL and tell them I need to connect via USB (for now, but also Ethernet longer term)
2. Do initial set up of broadband by connecting the cable modem via an Ethernet cable to the USB1 port (with a dongle provided by NTL?) on my old Win98 desktop.
3. Connect up the Linksys wireless router beteen cable modem and desktop and do the intial set up of router settings including security.
4. Connect the wireless PCMCIA card to my Win2K laptop
5. So now I have a wireless laptop and wired desktop (albeit through slow USB1) - then I can play around at my leisure to try the Ethernet card properly (or get a new card) on the desktop, etc
I guess my main concern is that I switch from dial-up to broadband and find that I cant connect up so I'm left with two older computers with no internet access and a monthly bill from NTL for broadband that I cant use, and no way of going back to dial-up! I couldn't cope with that!