That's why I spose you can't really find them allow my back patio doors look with a key from both sides so when the fire is blasing at the front door I spose I'm buggered
Yes it is for a back gate not a house, a chain is all well and good but will all my family members lock it every time they want to go through..... No
So there would be no point in having a lock, that's why I need a lock that locks automatically when shut,
Ignore the bit about a thumb turn, just buy another Euro-cylinder. I imagine that if you asked, they'd supply with a double cylinder instead of the thumb turn. Of course, if someone has enough access they can easily push the bolt back - and if there is enough of a gap then it can be done from the front with a flexible card.
In case you aren't familiar with them, the Euro Cylinder is a standard size/shape for lock inserts. If you look at the picture (the device is upside down BTW), the keyhole shaped bit passing through the mortice latch is the Euro Cylinder - as long as you have the key then it just slots in and is retained by one screw. Makes changing locks (eg on change of tenant in a rented property) a doddle.
You will also need escutcheon plates on both sides to support the cylinder, and will need to choose a cylinder of the right length so it doesn't stick out. While it probably doesn't apply to a garden gate (presumably they can climb over if they want), it's worth having a read of this : http://www.euro-secure.com/locksnapping.asp
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