In London clubs you can usually feel safe. You cannot enter inside with dangerous objects, drugs, drinks, even water. This selection also applies to the age and other requirements depending on the club.
You must be at least 21 years old to enter most of clubs in London. So if you have the misfortune to look for less than 21 years, and the bouncer has a bad mood, you will need to show your proof of identity. If you do not, he will not let you inside.
You can have a great time partying, but you always have to keep a minimum of care and safety. Do not leave your purse anywhere, have it with you all the time or give away all your belongings to the locker room. After a few drinks you can easy become a little more distracted, and then you can lose your property or it could be stolen.
Also keep an eye on your drink and do not accept drinks from strangers. There are cases of adding to intoxicants to women’s drinks. This is a big problem in the London clubs, even in those who are mostly considered safe.