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If you're obliged under the terms of your leases to contribute towards estate-wide service charges then collective enfranchisement would relieve you of any further obligation to contribute. The terms of the conveyance on collective enfranchisement are set out in Schedule 7 to the 1993 Act, and don't include any terms relating to contributions to the maintenance of upkeep of other land or property.
I had a case recently under the 1967 Act (acquisition of the freeholdof a leasehold house -similar but different) where the landlord (the Church Commissioners of E&W) tried to insist on a load of estate-wide service charge provisions being included. We challenged it, and on that point we won.
interesting again, my hope was that this might get us out of section 20 notices that get issued at the estate level which never benefit our 3 flats in any way