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We were recommended sash window locks like these after our window was prised open.
https://www.amazon.co.uk/Sash-Window-Stop-Restrictor-Polished/dp/B00BHF4FG2?ref_=fsclp_pl_dp_5
We put one at either side of the window and it certainly feels more secure than the old locks.
better windows > alarm. what's your front door like?