Within iPlayer, the only court offered in UHD is the centre court. From the iPlayer Home Screen, it should be showing Wimbledon content up front, select View All Scroll down to the second rail, where you will see the centre court match tile with UHD on it. Try searching within iPlayer with 'uhd' it will show quite a few programmes available in uhd.
Hi, Iplayer app on the LG TV works fine, thanks. It also works fine on the Puck if the programme I wish to watch has already been shown or chosen from the Iplayer search engine/ menus.