It was single locked and would have required a key to open it. Just like the front door Yale keys so prevalent in the UK when I was younger
Because there is no handle on the front door, the door can't be left in a state of "closed but accessible from the outside", not without a key.
So from the earliest reports that the door was left agar, to those that know that can only be the patio door. Despite this Gerry in his 4th May statement he went to the front door and used the key. Whether he meant the front door who knows but it was the only door that had a keyhole, so everyone hearing that thinks of the front door.
This is not supported by the others (Kate and Matt) who do the checks of 5A via the patio door.
I don't see any reason that would prevent Gerry using the front door on his check, provided he had his keys with him. He could come in via the front door and put his keys down on the kitchen bench, and since he left via the patio door didn't check that he had the keys with him at that stage.
In that article (
http://web.archive.org/web/20070519134145/http://www.express.co.uk/posts/view/6232) it says "The apartment block in the Mark Warner complex is just 200 yards from the sea" Is that in any way true?
I find that hard to believe. Who told the reporter it was just 200 yards to the sea? Yards not meters too, so it sounds more English rather than Portuguese resident.