tax on capital gains, page-61

Ladies and Gents,

I'm sure its been asked here before (or perhaps a silly question). Is it possible to defer my profits?
In my case for 2016-2017 FY I have profit (20k) however, for 2017-2018 FY (so far) I have a loss. Is it possible to roll over/defer profit? My thoughts are no I cant. It seems you can only roll over a loss?

Any thoughts would help. I normally do my own tax but am relatively new to shares and will likely seek tax advice but thought id ask. Thanks!