[lovemenot]

I would argue that FUD does exactly what you claim to not be doing. Raising concerns without substantiation, against an entire class of trading. Rather than just specific instances of bad behaviour.

I would add that the linked article, which is about car washes not ice-cream vans is equally FUD-driven. Weasel words like "linked to", "concerns", "thought to be" are used frequently, but no hard evidence of slavery is presented.

Slavery is a crime in UK. If there have been successful prosecutions and those demonstrate prevalence, rather than sporadic occurrence in an industry, then your blanket aspersions might be justified.

Otherwise, please refrain. Such FUD is likely to needlessly harm the business of law-abiding traders.