Tonight Series 25 Episode 6 Can You Boost Your Immune System? ( Air Date 2023-02-09 ) Genre News category. Overview "Britain has been in the grip of its worst flu season for almost a decade, and catching a cold or flu can have a huge impact on our health, the economy and the NHS - what can we do to protect ourselves, and is it possible to 'boost' your immune system? Reporter Kylie Pentelow finds out.".