Separation distances

Date:         17 May 97 15:15:53 
From: (SweepDog)
Organization: AOL,
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Please can someone answer the following questions

Say, going to the Mediterranean, in good flying conditions, what is the
minium permissable separation of aircraft to achieve maximum capacity?
i.e. horizontal (left to right, and forwards and backwards) & vertical

Also, I''ve noticed on a good day at Manchester airport, planes land about
a minute apart.  When Runway 2 is open, does this mean 2 planes can land
at the same time