What happens to the interest in my account when the bank rate falls or rises ? I know nothing of these things.

Question

What happens to the interest in my account when the bank rate falls or rises ? I know nothing of these things.

Answer 1

Then you need to educate yourself.  Read "Personal Finance For Dummies."

Answer 2

You keep whatever interest you've already earned. Let's say you have $1000 in a savings account. If the rate goes down you earn less interest  on that $1000 from that point on. If it goes up you earn more interest on that $1000.  Remember your balance increases when you earn interest.Every time the bank credits your account with the interest earned your balance goes up then the whole amount earns interest.