Non existent DVB-T reeception since retune

Until recently (around the 25th Sept.) I could receive all the Digital TV channels without a problem, then the message began to appear on screen about a retune on 30th Sept. from the 25th the TV would have no picture when turned on and it was hit or miss as to whether a picture would be received after a retune Since the 30th I have been unable to receive a digital picture full stop and the analogue picture is fuzzy at best.

I have tried just a channel scan and a first installation scan on the Technika 26" TV many time without success. The aerial is an internal job mounted in the roof, and about 200 metres away there are trees, hiding the M1 (I think)

The last time I had a DVB-T picture the signal was weak but but that was when I did a retune at 3am on the 29th Sept.

This happens to me a lot when I retune. I normally find that waiting a couple of hours and trying again helps. You could also try adding channels rather than a full retune, if you have the capability to do that - all that's needed during the retune process is a bit of interference and it will skip past the multiplex.