UKTX

Together TV

Logical Channel Numbers are assigned by the platform, not carried in the transmission, which is why they differ between nations and why a retune can move them.
Channel numberWhere that number appliesMultiplexSystemFormatAvailability
83England, Scotland, Northern IrelandCOM4 (SDN)DVB-T16:9 SDTV

On COM4 (SDN)

93 transmitters radiate COM4 [V] — the main stations only, not the relays. By nation: England (66), Scotland (14), Wales (10), Northern Ireland (3). It is operated by SDN (ITV plc).

If this is missing, so is everything here

48 other services share COM4. A multiplex is one 8 MHz transmission carrying all of them at once, so it arrives whole or not at all — losing exactly one of these and keeping the rest is a fault in the channel, not in your reception.

QVCU&Drama5USATJCU&WITV2 +15Star5ActionQVC25 +1LegendGreat! ActionITV3 +1ITV4 +1Great! MoviesBlazeTrue CrimeTrue Crime XtraShop on TVWildEarthBlaze +1PopTiny PopKetchup TVKetchup TooAl Jazeera EnglishAl Jazeera ArabicTrailblazer TelevisionOn Demand 365France 24Odyssey TVEuronewsMBCSonLifeAlaraby NetworkROKRevelationNew Media TVChannelboxNHK WorldNewsmaxAmazing Facts TVCNA OriginalsNoseyPurpose MediaGIGSMusic & MemoriesOutdoor Channel

Which multiplexes should reach a particular address is the postcode lookup.