Stopping up drafts in floorboards has been done in a numbver of ways over the years. Some people make paper mache with newspaper and squeeze it into the cracks. Some use sawdust and glue to give a good colour match.
Now there’s Stopgap – something invented just for filling gaps in floorboards. You just put it in and push it down and it forms an invisible barrier.
Find out more about them and how to fit stopgaps at their website