In the past I have started them off in an unheated greenhouse in late spring [Feb/March]. In a shallow seed tray of soil based seed compost. I usually use John Innes number 1.

Me too. No heat needed.

Thank you guy's for your advice. My seeds came in a packet with no sowing instructions on it, so I will write your advice on the back of the packet. Once again thank you and a happy and safe Christmas to both of you.
Kind Regards
Marian

I agree, but I don't have a greenhouse so the kitchen window sill works for me - just give them a quarter turn each day so they grow straight. You don't need a heating pad unless you are moving to Alaska. I start my seeds in cow pots inside usually latter part of February. By April, you'll have nice size plants that can be planted outside.

Thank you Bathgate, I will include your advice along with that of Seaburngirl and Owdboggy, I hope you have a safe and happy Christmas, Thank you.

Thanks Marian. Happy Holidays to you too.