After a long painful to/fro over email with Philips, they sent someone last week to look at it. They replaced the main motherboard (effectively replacing the TV) but the same issue remained. They went away to think about it. Today they collected the TV to conduct more testing inhouse. I think it is clear by now, after three consecutive TVs have had the same issue, that it is a generic issue with the TV and so its completely unnecessary for them to take my TV for testing. Just do the testing on any one they have already in the workshop. The only thing I can think is that there is a software/hardware issue in the manufacture that prevents the tuner from tuning to the particular frequency of the Tunbridge Wells antenna for HD channel (682Mhz). My worry is that they are just going to plug it in in the workshop and find that it scans HD channels fine from their local antenna such as Crystal Palace, and think its fine. But the CP antenna runs on a different frequency, as do other antennas around the country.