This section of the website includes the two entering the UK pages below.  It should also be read in conjunction with the Visas and Leave To Remain section of the website, as much of the latter covers making applications to come to or visit the UK from overseas.

Conditions on granted visas — http://needtoknow-immigrationuk.com/conditions-on-granted-visas/ 

Immigration clearance — http://needtoknow-immigrationuk.com/immigration-clearance/

Immigration interrogations — http://needtoknow-immigrationuk.com/immigration-interrogations/