I gave the six most advanced tomato seedlings to my uncle. He is a keen 'tomato enthusiast' and has put them into a heated propagator on a sunny windowsill in his house. He hopes to bring them on and put them out in the greenhouse when the weather improves.
My uncle also has another propagator which stopped working a few years ago. I will have a look at it when he gets it out of storage in his attic. It is the same make but different model to the one my Dad had for many years and which i repaired a couple of years ago.Read here for more details.