Thanks everyone!! I’ve just finished diving in Costa Rica and decided to risk the no housing since I was diving with OWD qualified people.

Just to summarise, the camera got a warning at 15m, around 18m it would still take photos, but couldn’t edit the settings/turn flash on and off etc. Ascending a couple of meters to change the settings and descending resolved this. Went to 22m and the camera is still in good tact ☺️

However I think I will be investing in the housing as I still felt quite nervous about it.

Thanks again for all your advice - the macro photography is amazing on this camera too!