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it states that you need a deed from the landlord, which the seller avers is his sister (who is the registered proprietor)
He would almost certainly be wrong on that. The landlord is (assuming there are no intermediate or mesne leases) the freeholder, which from the sounds of things is the tenant-owned freehold company. Feel free to send over a copy of the lease and I'll tell you what hoops you need to jump through before the garages can be transferred.
Every garage used to belong a flat, so for example garage number 2 is on a lease that is detailed within the lease for flat 37. The garage specific lease is registered at LR, and I've got a copy, it states that you need a deed from the landlord, which the seller avers is his sister (who is the registered proprietor) but a friend who knows something about this said that I should seek legal advice as to whether the landlord was indeed the sister, or the current owner of the flat.
My ignorance in this area is amazing, and the very real possibility is that I read something that says in legalese "any sale has to get the permission of the owner of flat 37" as saying "fill your boots, no worries pal".