Back from the garage.
Took a while but they’ve agreed it’s not right. As for fixing it ………………. they say they’re going to have to get hold of an 85 Enyaq with Canton to compare (so that should be easy!!). Service tech said it was working (barely) and the sales manager said he’d had a Skoda with the Canton system and the subwoofer was very, very noticeable!.
So, booked in for next Wednesday (24th), may be a full day, may be longer, may have to take it home and bring it back again if it needs bits 🙁
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!