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jellybaby
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