Documentary:

Warship, 8pm, C4

Kiera ( above) and the rest of the crew prepare the vessel for a visit from Theresa May. Stoker Michael Hedgecock is in troubled waters as he finds himself up on a serious charge and second- in- command Nick Wood must be the judge and jury. HMS Ocean is buzzed by more than a dozen Iranian gunboats on her way to the Persian Gulf, where it takes over a vital role from a US aircraft carrier