Changing the kernel in Spyder Notebook

[Stephen]

I need some advice on how to select a different kernel to the default for the Spyder Notebook please.

I use virtual environments to separate developments - each with their own kernel selectable through the Spyder IDE and (Jupyter notebooks too) but I cannot see how to select any of these kernels when working on a Spyder Notebook - I only see the default option.

Any thoughts please?

Thank you.