Sorry for your news Chris. Actually choked is more apt. We have had lots of cats over the last 21 years and every single time we lose one it breaks our hearts. Two of our current four are getting older so we know what to expect and, like you, will always put them and their health before anything else on this earth no matter what the cost. Every move house wise we have made has always been subject to suitability for cat safety.
Myself and Lady HB are both with you and your good lady at the mo.
HB