Can I transfer the funds and assets in my uk pension scheme or do I have to liquidate them into cash?

This will depend on your existing pension provider and the assets that you hold in your UK pension scheme. Generally a transfer will be quicker if converted into cash. It can also prove costly and time-consuming to attempt to transfer the existing assets.
If your UK pension fund is held with an insurance company or with a final salary scheme then the only possibility is a cash transfer.