100 - (price trading) = implied libor rate.
ie Dec05, 18:00GMT close price of 95.23
100-95.23= 4.77%
Sterling futures settle against LIBOR which i think historically averages about 12 basis points above the BOE base rate. ie: 4.65% for base in this example
Do this for each contract on the strip and you will build up the curve out to Mar 2010
Hope that helps.