Consumer Infinity does not provide a static IP address, you need to pay the extra on the BT Retail business products.
NAT should accomplish what you want.
i set up my neighbours HH3 this evening and I am sure I noticed a DDNs option, so something like No-Ip can be used.
Ok a static IP number it is not, but it is pretty close
Desktop machine now powered by windows 7 pro 64bit , laptop by ubuntu
On ADSL24 using C&W network.