Rules about when to use losses made in previous years

My question is about previous years’ capital losses and when they can be offset against gains. I understand about using in-year losses against gains, but are there any rules about when you can use previous losses? In my situation, I have a capital gain which qualifies for BADR, so will be taxed at 10%. I’d like to hold onto losses from a previous year and use these to offset some capital gains in the future which will be subject to considerably higher rates of tax than 10%. Can I do this, or do I have to use them at the first opportunity? Any help appreciated.

Hi
Previous years losses can be carried forward and used when you want to use them.

Thank you very much. Very helpful.