Well its interesting that both individuals claiming to have got in with mere 2.1s have failed to stipulate their actual final degree average, just some vague idea that their 3rd year wasn't as good as their first two, which is neither here nor there without figures, and make no reference to their offers.
I know at Camb the BoGS interprets a 2.1 as 67.....
My feeling is offers are the same for everyone no matter what their current mark is, in recognition that you've not yet got that degree at that mark, and anything could happen- in exactly the fashion the above 2 posters have alluded to themselves in their final year. Departments are still likely to want their entrants to meet a basic standard.
Obviously none of this could be set in stone without a survey of all departments at Oxbridge, and none of us have that. But what I said remains true for very many courses- "it is likely to be at very minimum a 65".
Contrariwise, telling potential applicants they can make it with just a 2.1, when in reality, and the vast majority of cases, people will need significantly higher than that, is a little misleading. For example, anyone interested in the BCL needs to be aware that a 1st is a pre-requisite.
I do not believe, unless someone could show me their offer letter, that any applicant is given a mere '2.1' offer for any Oxbridge Masters, unless they are a current Oxbridge student....perhaps. 'Probably not'- were you already a current student at the respective Ox or Cam when made the offer?
By all means apply. But when there are 60 places and 400 applicants (as for some courses), I somehow doubt the basic 2.1 applicants are going to be frontrunners for offers.