Good afternoon Diane,
Sorry for the delay in responding, ITV Encore is a subscription based TV channel (not free to air), so to watch it you either a Sky subscription, at which point you can watch it on channel 123, otherwise you need to subscribe to the NowTV Entertainment Pass.
Depending on if your Panasonic TV is a smart TV you may be able to download the NowTV app once you have subscribed, otherwise you will need to buy a Now TV box which plugs into the TV, please see here for more details about Now TV.
Please let me know if you have any follow up questions, for which I am more than happy to assist you with.
No problem, appreciate if you can rate the service received using the star rating on the page.