N reg Astra mk3, 1.4 single point craap

rite.. over the last month i've noticed my engine isnt its usual self 1st thing in the mornings, especially in the cold. it's hesitant, seems to lack power, needs running for about 10-20 seconds really before i think its 'safe' to start driving.

once i've driven the car for a few mins its perfectly fine and will be for the rest of the day.

any gen with wots up?