Hi @Damobolton. You can not connect a smoke alarm to the Ring Alarm System in the UK. It looks like this is a requested feature mentioned in our Feature Request Board here. Feel free to comment and vote for this request. 
Hi @Damobolton. You can not connect a smoke alarm to the Ring Alarm System in the UK. It looks like this is a requested feature mentioned in our Feature Request Board here. Feel free to comment and vote for this request.