Carrying forward a loss when not trading/submitting a return

Hi All, please can someone help. I made a loss several years ago and have been carrying it forward for use in later years ('Losses available to be carried forward'). These days I have not been doing much trading outside of my ISA, so I don't need to do a tax return this year. Do I still need to submit a return in order to continue carrying my losses forward? It's awkward and difficult to populate the CGT section of the return without any trades, but I don't want to lose access to these losses should I need them. If I don't submit a return for a few years and then need to use the losses, will they still be valid given I registered them previously? Do they expire? Many Thanks

Hi,
Not if you do not have any other criteria, as the losses will already be registered, they will carry forward until you need them.
Thank you.

Thanks for the response, I will forego submitting a return until the next time it's needed. Appreciate the clarification.