Hi I live in a bottom flat but share cost of repairs with upstairs flat. The roof has been leaking have had it repaired couple times .the nails are what they call nail sick.the cost I have been told is £7,850 If they use the old slates.it's a two bed flat end terrace.the two flats sold as leasehold I think I have legal obligation to pay but have no funds. The price is very scary lot more than I thought it would be. Any advice ? Thanks