weak startup

On a morning, over last few days been much colder, however when I pressed the brake and start button, the car started and fired up, but without the same almost power, was sluggish and sounded it too.

I stopped and restarted it and all was good, happen few says in a row, can be intermittent, like a splutter, change spark plugs on next service, car is on 60k. Any advice please or experiences?
 
Mine has done the same but had a recent service , few seconds then kicks in fine , mind you it must be 1oc outside , silly cold !