Ok so Finn has just given me the fright of my life and I am not happy with him (and he knows it).
I put a gate up separating the hallway to the kitchen (as the kitchen has no door being all open). As i was setting up Myrtles crate and cleaning it, I noticed Finn was very quite. To quite. Hmm….
I went out calling him and noticed the gate to the kitchen had been knocked down (possibly by me to be fair). I knew where he was, he was behind the washer. Not just that be under the units (basically into the foundations of the house where all the gas pipes are). 
I was worried sick that he could go deeper into the house, or hurt himself, blow us up, or not come out! I was panicking. He did come out and i quickly blocked the “tiny” gap with towels before he could go back in and grabbed him firmly out of there.
I am going to need a baby gate there as I cannot risk that happening again!
Would you recommend any make that can be set up with pressure at both ends appose to bolts, with bars thin enough?