@snottyotter one of these? you will need to measure stuff more but it shouldn't be too hard to swap out.
http://www.diy.com/departments/diall-25mm-brass-effect-euro-cylinder-lock/259521_BQ.prd http://www.diy.com/departments/yale-29mm-nickel-effect-thumbturn-euro-cylinder-lock/255242_BQ.prd http://www.ebay.co.uk/itm/YALE-EURO-THUMB-TURN-CYLINDER-KMT35-10-35-NP-BRITISH-STANDARD-6-PIN-NICKEL-/181278348558?pt=LH_DefaultDomain_3&hash=item2a3508150e
https://www.youtube.com/watch?v=udgnrM11fX8
Yeah, basically that but by modifying a key, they're actually about the same price so might just buy one, although my wife has an irrational fear the kid will run off in the night of we can't lock the door where she can't reach.
@snottyotter started
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@snottyotter one of these? you will need to measure stuff more but it shouldn't be too hard to swap out.
http://www.diy.com/departments/diall-25mm-brass-effect-euro-cylinder-lock/259521_BQ.prd
http://www.diy.com/departments/yale-29mm-nickel-effect-thumbturn-euro-cylinder-lock/255242_BQ.prd
http://www.ebay.co.uk/itm/YALE-EURO-THUMB-TURN-CYLINDER-KMT35-10-35-NP-BRITISH-STANDARD-6-PIN-NICKEL-/181278348558?pt=LH_DefaultDomain_3&hash=item2a3508150e
https://www.youtube.com/watch?v=udgnrM11fX8