* "How are you?"
* "How's it going?"
* "What's up?"
* "Alright?"
* "You alright?"
* "How's tricks?"
* "How's things?"
The specific phrase that you use will vary depending on the region of the UK you are in, as well as the formality of the situation. For example, "Alright?" is a very informal way of saying "how are you?" and is typically only used among friends or family.