ITV’s video-on-demand services are regulated by Ofcom (the independent regulator for the UK communications industries) and the Advertising Standards Agency (ASA) in relation to advertising content.
Should you wish to contact Ofcom, the complaints page for VOD services is here https://www.ofcom.org.uk/
You can contact the ASA by post at Advertising Standards Authority, Mid City Place, 71 High Holborn, London, WC1V 6QT, or by telephoning 0207 492 2222. Further information about the ASA can be found at www.asa.org.uk