Tenant fees act 2019 :
Landlords or letting agents cannot require tenants to pay for the services of a third party, including chimney sweeping services.
If the tenants prefer to employ the services of a third party, they will be responsible for any associated costs.
Landlords have a duty to ensure the property is maintained safely.
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/922900/Tenant_Fees_Act_-_Tenant_Guidance.pdf