"after market head lights ect (additional wiring)"
this is very possible . . . . as is cheap USB chargers and the like.
but its easy to see if that is the case........
disconnect your aftermarket lights,USB chargers, etc etc etc . . . . so the van is stock.
and see if it makes any difference. . . . . . . . . . If it makes no difference, then thats not the problem.
The thing with DAB is that its very picky with signal level - ie it needs a very good signal area. . . . your listed at
Wembdon, Bridgwater, UK so lets see if any other members close to you have similar issues.
whats your FM reception like in the same area?
is it any different with the ignition on? or engine running? lights on? lights off?
are the national stations like BBC etc received ok?
have you re-scanned the station list regularly to keep it updated?
..........................
so first you need to know if you are in a good signal area . . . . .
then see if anything in the van is interferaing with the radio reception,
you could try a third party antenna as a test, or look at a roof top antenna . . . .
**************
more info here >
T6 Aerials, Gps, Dab, Fm/am, Gsm - How I Did It -
ukdigitalradio: Coverage
DAB coverage plans
Search Results for Query: dab | VW T6 Forum - The Dedicated VW Transporter T6 Forum
https://www.amazon.co.uk/s?k=dab+an...&sprefix=dab+anye,aps,147&ref=nb_sb_ss_sc_1_8
****************