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Hi , I`m JackPerhaps I can help you with this problem
Without the model number it would be difficult to be specific but if it is as old as a crt/picture tube tv then it is too old to pickup any digital programming and as far as i know the UK also went all digital some 6 years ago.
This means that you would need a small digital to analog tuner/converter box between the tv`s audio/video inputs and antenna or cable you have for signal.
Again ,if you want more details let me have the tv`s model number on the back cover , otherwise If that answers your question please do not forget to rate by clicking on the star icons at the top of your page, then click on Submit so i get paid for my time helping you .Also note that it will not close this post , you can come back here at any time (free of charges) if you have questions or need further help.