I live in a mixed block of flats – do I pay for the tenants’ works through my reserve fund?

No, you only pay for your contribution due. If you live in a block containing 10 flats, five of which are owned and five tenanted each homeowner will pay a contribution based on the apportionment set out in your lease i.e. if unit-based apportionment you will contribute 1/10th of the cost of the works. The tenants would also pay 1/10th as a contribution, which is paid for through the tenants’ rent.