Thank you for your replies so far :)
The seeds haven't sprouted yet as I only planted then a few days ago, I have them on a southern windowsill right next to a radiator.
The propagator dosen't have a light, its just a little plastic box with a lid and a compartment where the soil drains into. I don't have a plant light in the house but I do have a few really warm and bright desk lights, if I pop the seeds under one of those will it do?