Changes to frequencies on the Chatton transmitter were carried out earlier this month as part of a major engineering programme being carried out between now and 2020.
Some Freeview channels are moving to new airwaves to allow for the future development of new mobile broadband services.
However, while some viewers were able to simply retune their sets, Freeview advised that some older aerials may need to be replaced to continue receiving all channels.A Freeview spokesperson advised: “If readers have found they are missing Freeview channels, retuning their TV or box should restore full services in most cases.
“Anyone who needs help with this or who finds that retuning does not bring these channels back should call the Freeview Advice Line free on 0808 100 0288 (opening hours are 9am to 6pm Monday to Friday and 9am to 5pm on Saturday).
“Some viewers may be eligible for free in-home support, including aerial work if needed.
“However, should they choose to arrange independently for an aerial engineer to carry out work, we cannot refund any costs they incur.
“As such we advise anyone having any issues to call the Freeview Advice Line first and they will be able to receive individually tailored help from our trained agents. If viewers have lost access to their main standard-definition Freeview TV services, we aim to restore them within 10 working days of their appointment booking.”More information can be found at www.freeview.co.uk/tvchanges