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Freehold itself cannot be shared
Erm, it can. A freehold estate can be held by up to four people as joint tenants. Section 34(2) of the Law of Property Act 1925. It's unusual to have the freehold owned directly by the lessees - generally speaking you're right in saying that it will be held through a management company - although I have seen a very few cases where it was held directly by the lessees. If there are more than 4 flats then obviously that becomes rather difficult given the limitation imposed by section 34(2).
Bear in mind that not all leases will necessarily have the same years remaining. So if your lease is 60 years and the others 80, your marriage value will be significantly greater.
Most importantly there is no such thing as a share of freehold flat
Freehold itself cannot be shared, which is why lessees belong to holding companies. The company owns the freehold, and you are a director of that company. It's a very confusing and antiquated system!