Post exchange / how long to leave between exchange and completion

F37A

Jonboy_1984 said:

When we sold last year our buyer was saying he wanted a fairly quick transaction. Our solicitor said the fastest a leasehold sale would go through was 16 weeks and 20 wouldn’t be unusual, so 26 weeks isn’t really too far out the (very frustrating) ball park.

How does your proposed property relate to the roof space for a survey? If there are other flats at roof level, they may have parts of the lofts within their demise, and the freeholder might not be able to arrange full access?

Our last flat only had 6 metres of pipe that would have been relevant to a drain survey for that flat.

So its a ground floor flat. 4 storey block. Flat roof. Leaseholders liable for roof hence don't want to pay for that upon moving in for example out of the blue. LPE1 response S20 is ok. But there's suggestion that's no enough to avert large bill if Freeholder wants to issue.
Yeah it may be that drainage costs for repair are shared responsibility between all leaseholders but solicitor indicated that it might not be. i.e sole liability could rest with me for some part of drainage system.