Gazeta wrote:
Hello how can I get to London center from Heathrow,

Various ways including the Piccadilly Line of the Underground. Where in
central London do you want to go to?

and how can I get back in the night at about 2 a.m ?

Why do you want to return to Heathrow at 2 a.m.? There are no flights
scheduled to arrive or depart at that time of night.
--
Richard J.
(to e-mail me, swap uk and yon in address)