Here are some links to claim stats from insurers with the date that they were published. Click on the company name to access the claim stats:
British Friendly (Published 14th January 2020).
Holloway Friendly (Published 21st January 2020).
The Exeter (2018 stats published 2019).
Vitality (Published 17th June 2019)
Aviva (Published Spring 2019)
Dentists Provident (Published June 2018).