There are restrictions on what information can be found via on-line searches:-
Births - 100 years or more ago
Marriages - 75 years or more ago
Deaths - 50 years or more ago.
Censuses - 100 years or more ago.
A personal visit to a 'records centre' can elicit more recent information.
On-line images are not considered valid for legal purposes, but you can generally get a 'hard copy' for a fee, this WILL be considered legal.