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Nope, but am aware that would add cost. The owner of the downstairs flat has mentioned the possibility of us obtaining and sharing the freehold (I think she's let the lease run down to something silly like 70 years) which would no doubt make the whole thing simpler. Been meaning to post on that subject as well, I can't decide how the pros and cons stack up against each other.
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Collective enfranchisement. This is a good place to start.
http://www.lease-advice.org/publications/documents/document.asp?item=11
There is a cost calculator online somewhere. I had a look and it estimated £10-12k per leaseholder total costs. I think that wouldn't be much more than what I would cost to extend our lease (currently 94 years) so is well worth investigating.
My ground rent is pretty low and we don't pay a service charge, however the management company charges £110 twice a year to collect our ground rent which is rather annoying.
Have you checked the loft is part of your lease?