More than 600 family and friends are thought to have arrived at the funeral.
Some 200 people packed into the church, which can seat 150, while more than 400 stood on the grass outside.
The Rev Emma Davies described Claire as a "truly beautiful" person who "sparkled".
We gather to remember Claire and to give great thanks to Claire who gave so much to so many people.
The funeral of a woman from Leicestershire who died during the London Marathon will be held in the family’s home town at midday.
The best friend of Claire Squires from Leicestershire, who died in the London Marathon, says the family is overwhelmed by the donations.
Donations to a charity in honour of a runner from Leicestershire who collapsed and died during the London Marathon continued to soar today.