Adding locks to uPVC door?

[Belf]

Hi,

We only have locks on the vertical side of our UPVC door, not on the top or bottom. As a result, the door doesn't really seal very well and lets through a draught. The wind howls and if you push the door at the top or bottom, you can feel it seal properly.

Is it possible to replace or add to the locking mechanism with one that has bolts on all three sides? I think this would solve the problem.

Thanks

 

[masona]

Have a look to see if they are adjustable first or may need a new seal