My mum and dad have received a card from at800.tv informing them that their area is to take part in field trials of the 800mhz band for 4g. They live in the Isleworth and Brentford area of west London and have been told to expect a filter in advance of the start of the trial on 29th April. Am I right in guessing that since Crystal Palace's channels are from 22 to 30, i.e. nowhere near the old 61 and 62, there's not likely to be a problem? I'll report back.