Any one got admission in any london university including Westminster with 2:2. Mine percentage in LLB is 51% only but have professional experience of 9 years. Should I try my luck?

There's an old thread here where a representative from Westminster said that applications are generally evaluated holistically, and a 2:2 wouldn't necessarily be a dealbreaker:

https://llm-guide.com/board/uk-ireland/lower-second-class-admissions-67033

In general I think that this advice stands. Westminster is not as competitive as other schools, and your work experience would be valued. This is what their site says FYI:

You will also be considered without standard qualifications provided you are sufficiently motivated to study effectively on a Masters programme and/or have had a significant amount of relevant experience.