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You won't get a mortgage on anything less than about 70 years these days.
Obviously there are ways around it (like ensuring that the previous owner has already started negotiations for extending the lease), but the shorter the lease, the more money the leaseholders can ask for.
It's why you'll see a 2 bed flat in Fitzrovia for half a million quid and a lease length of 12 years. An extension on that will be around a million of your finest pounds...
Go and view it anyway and try and get some info out of the agent.
Stuff that's marketed as "Cash buyers only" is generally unmortgageable for whatever reason.
Also, marketing like that tends to only encourage builders or developers.