Closed season national hunt racing

When there was a closed season in national hunt racing? Did it end with a meeting at Market Rasen and start there later in the year?

Did the jockeys and trainers title run to the end of the season or till the last big Sandown meeting?

Answer: The season used to be bookmarked by meetings at Market Rasen in late July/early August through to late May/early June and it is probable that all races in this period were counted towards the jockey championship.