Hi, Is the front door wood or uPVC? If its wood im pretty sure the reason it wont close is because of the wet/winter cond`s weve had and that has made the door swell and is now catching/hitting the frame? If its PVC you need to alter the hinges which you`ll probably need a alan key for, the adjustment slot is located on the underside of the hinge on the inner of the door.
Billybob
December 2010