* Within-day gas rose by 1.75 pence to 64.00 pence per therm as of 0900 GMT.

* Day-ahead gas was up 0.95 pence at 63.75 pence per therm.

* A decrease in gas supplies from Norway and expected colder weather were behind the price increases, a trader said.

* Norwegian gas flows to Britain fell to 81 million cubic metres (mcm) per day, from 91 mcm/day on Wednesday, as gas flows through the Langeled pipeline decreased.

* Consequently, the system is undersupplied with demand forecast at 235.8 mcm/day and flows at 229.6 mcm/day, National Grid data shows.

* Average daily temperatures in Britain are expected to be 10.3 degrees Celsius on Thursday, falling to 7.7 C on Friday and to 8.4 C over the weekend.

* Prices rose despite strong power output from wind turbines and an expected stream of vessels arriving with liquefied natural gas (LNG) until the end of next week.

* Peak wind generation is forecast at 11.2 gigawatts (GW) on Thursday and expected to rise to 11.3 GW on Friday, nearing a total metered capacity of around 12.1 GW.

* Britain expects five LNG vessels by the end of next week .

* December gas contract rose by 0.93 pence to 65.70 p/therm.

* Day-ahead Dutch gas at the TTF hub rose by 0.07 euro to 24.40 euros per megawatt hour.

* The benchmark Dec-18 EU carbon contract rose by 0.10 euro to 19.39 euros a tonne.