Compassionate leave is not allowed either. That's what Oxford asked for Jacob Clouting.
Story here: PREVIEW: Key battle for Chargers in Scotland – OXFORD SPEEDWAY
Relevant paragraphs:
Chargers will be going into action at Edinburgh without skipper Jody Scott, who is due to be riding for his Cab Direct Championship club Redcar at Glasgow on the same evening. They will also be missing Max Broadhurst (ruled out for the rest of the season with a hand injury) and Jacob Clouting (due to the birth of his daughter).
Cooper Rushen and Harry Fletcher will guest for Scott and Broadhurst respectively. Chargers were due to utilise rider replacement for Clouting, but he has not been granted compassionate leave by the Speedway Control Bureau and Chargers will use the unattached Kieran Douglas instead.
Personally, I think speedway needs to move with the times and allow such leave, but unfortunately it doesn't.