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Formal/Statutory is normally cheaper than Informal, since Formal/Statutory is run by legislation which determines maximum amount charged and specifies no changes to lease.
Informal has no such guarantees or determinations so it can be more expensive up front, or cheaper, but include changes to the lease to make this money up elsewhere.
General advice on the matter seems to be: unless you have / are a very good lawyer, stay away from informal.
Thanks you two. The value is about right I think, based on online calculators. 4k for legals sounds about right too. @BleakRefs is the formal lease extension normally cheaper than informal? Formal as in, statutory?