I forgot about this thread and should have updated it with this info:
Although my Satellite channels all work well using this scheme, I have failed to create a bouquet for, or including, working DVB-T channels.
The entries are there but are not recognised by tvheadend as valid entries, so they are not mapped.
It was not a bother for me as I have few DVB-T channels and they don't vary, so a manual set up of the DVB-T channels is fine for me.
It would be good to know if this scheme could be adapted to get valid DVB-T entries for the generate Bouquet.