This HMRC advice page helps you find out if you’re eligible and how much you can claim to cover wages for employees on temporary leave (‘furlough’) due to Coronavirus (COVID-19).
https://www.gov.uk/guidance/claim-for-wage-costs-through-the-coronavirus-job-retention-scheme
Furlough Letter Template
ACAS have produced a free-to-download template for employers to use to confirm that there is an agreement to temporarily furlough a worker or employee.