How to view old recording whilst recording new programme?

I time shift most of my TV viewing.
It started a few years ago when I was married and had kids and had to respond to "Dad, can we..............?"

How to I view old recordings on my 7020 whilst a new recording is being made?

The File menu does not seem to work whilst the machine is in record mode.

Whatever happened to multi-tasking??

PLi Jade image.