If your handles look like this then you have a multipoint locking system
Multipoint locking system
lock detail
Standard cylinder
upvc door locking point
upvc door roller used for compression but some insurance companies will accept this as a locking point
Older style Ferco latch only non locking point
upvc door locking point
Older style upvc door everest system showing latch non locking point and bolt locking point
upvc door locking points top and bottom the middle latch is not a locking point