The number one tip is to make sure you remember to lock and bolt all your windows and doors, whether you are in or not. It’s very important to do this (especially at night) because if it’s left unlocked it becomes very opportunistic. In the same line of thinking, make sure that you don’t leave a door wide open, even if people are moving in and out.
Of course, if you live in a flat, this can be easier said than done, but try to make sure the main doors to your building are not left unlocked or on the latch. It’s important to not cut corners and to remember to take a key with you when you leave, and to not just leave it so anyone can get in. Make sure everyone around is aware of the safety measures which should be reasonably taken.
There are also other ways to feel safer in your flat which aren’t about any fear of burglaries. For example, make sure that hobs and ovens get turned off after use, due to risk of a fire if they were left on for a long period of time. This is especially the case for gas ovens as inhaling this can be toxic. It’s also important to check that your smoke detectors/fire alarms are working (and working well!) as there can be surprising issues such as your alarm not being set to the correct volume.
It's important to always take your own personal security measures, such as locking your bedroom door. You could also consider carrying something like a “self-defence identification spray” or a personal alarm which can be easily set off. These can easily be found on Amazon and may make you feel safer when walking to and from places.
Ultimately, the best thing to do is to try not to panic; as long as you are taking reasonable precautions, there should be no reason why you at a higher risk than ever before. Don't fear Newcastle's boogeymen, the balaclava men!