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What's the best middle ground? Sash bolts that you unscrew are a fiddle when you want to open the window and you have to remember to put the things back in. Something like https://www.reddiseals.com/product/sash-window-restrictor/ looks reasonably secure although maybe harder to install?
jellybaby-
The window restrictors are more useful for childrens bedrooms where you want to vary window opening but also stop small children from opening the window. In lower security situations they can be enough.
There's really no middle ground. Sash bolts are 101. Centre bolts (brighton fasteners etc.) as well, more for show than anything else since they're easy to defeat. Even then there are security issues with sashes, especially at ground level in London.
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we have the restrictors plus a lock with small key in the middle horizontal section. Something like the ones in the link but less chunky. Seem to work well so far as a deterrent. Happy to send you the number of our installers if you are SE https://www.locksonline.co.uk/Sash-Window-Locks/Federal-Sash-Window-Security-Lock.html
P.S: apologies should have condensed both replies on a single post
Airhead
frankohara
The police actually recommend painting them shut! Not very good for my business restoring them.