Thanks very much everyone

IF we get that house (going to auction tomorrow, wish us luck!) we'll definitely be installing the gates top and bottom. DS is crawling and standing up to furniture but now walking yet. When we went to see the house again a few days ago, I went with mum and my DF. Mum had him initailly and then decided to put him down as he was whingeing.....she left him near DF who she thought was going to watch him, and took off with me. The next thing I hear DF screaming as DS was 4 steps up and intending to go further. Boy I got in trouble.....and it wasn't even me who put him down!
My concerm with the gates is forgetting to lock them and also if there is fire, and we're upstairs and the gate is locked, in the mad panic I'll break my neck!! lol. If it was just me and DF I would be fine, it's just that we now have a very curious and mobile 15 month old who is into EVERYTHING!