The contributions into your pension account will stop when you leave, but your fund will continue to earn investment returns. Alternatively, you can transfer your fund to another pension provider.
If you get a new job you may be able to transfer your fund to your new employer’s pension scheme. This will depend on the particular arrangements of your employer’s scheme. The choice is yours, but, if you are considering transferring your fund, make sure you understand what you are giving up and what you are getting in return.