* Within-day gas price up 1.05 pence at 28.30 pence per therm by 0752 GMT.

* Day-ahead gas price up 0.50p at 28.50 per therm.

* Traders said lower imports from Norway had left the British gas market undersupplied, while expectations of weaker output from the country's wind farms buoyed gas demand from power stations.

* Imports from Norway through the Langeled pipeline were expected at 57 mcm on Monday, down 16 mcm from the previous day.

* UK Gas system slightly undersupplied by 3.6 million cubic meters (mcm) with demand forecast at 180.2 mcm and flows at 176.6 mcm/day, National Grid data showed.

* Peak wind power generation is forecast at 6 gigawatts (GW) on Monday, falling to 3.2 GW on Tuesday.

* "Gas for power consumption is forecast at 67 mcm/d today slightly higher from 63 mcm/d on Friday," analysts at Refinitiv said in a daily research note.

* Further out on the curve prices also rose.

* July contract up 0.25p at 27.70p/therm.

* September contract up 0.70 at 32.20 p/therm

* Day-ahead gas price at the Dutch TTF hub down 0.30 euro at 10.00 euros per megawatt hour.

* Benchmark Dec-19 EU carbon contract up 0.41 euro at 25.71 euros per tonne.