If you are applying a job at HSBC and Halifax then you should be able to answer following questions and know about competency based interviews.
You may also receive numerical tests which will be online at their career sites. We have very useful aptitude tests guides on this job forum so you can take a look.
Tell me about yourself
Why do you want this job?
How do you evaluate success?
Describe a difficult work situation / project and how you overcame it
What were your responsibilities?
What do you know about this company?
Why are you the best person for the job?
Give some examples of teamwork
Why should we hire you?
good luck.