Some great tips and ideas here! Thank you everyone for sharing.
However, for everyone saying that they run their dishwasher/washing machine overnight or when they are out, please don't. Our local Fire Service visited us to do a fire safety check. Not something that we requested, they were just going house to house, providing awareness and fitting smoke detectors where necessary. Whilst we had smoke detectors they replaced ours as theirs were far more sensitive. I understand that most Fire Services in the UK offer this to anyone who requests it and I would recommend that you take them up on it if you can.
They were very clear - robustly so - that you should absolutely not run dishwashers, washing machines or even worse dryers at any time when you are not physically present or awake, due to fire risks. Very rare of course, but it does happen and better to be safe than sorry.
They also advised us on a fire evacuation plan by checking the layout of our house both upstairs and downstairs in relation to escape routes. We all now know what we should do should the worst happen. Not necessarily something to make life easier but something that makes us feel safer.