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When Conservative MP Harriet Cross runs the London Marathon on Sunday, she is hoping to hit the finish line well within four hours.
If she can get there in under three hours 57 minutes, that would make her the fastest female MP, beating a record currently held by Jo Swinson, Liberal Democrat leader in 2019.
Cross is aware of the record, but is not counting her chickens.
"There is a 26.2 mile course between me and that at the moment, so I don't need to get ahead of myself," she says.